Robotic tormenter depresses lab rats

Hal Hodson, technology reporter

(Image: Chris Nash/iamchrisphotography/Getty)

Lab rats have a new companion, but it's not friendly. Researchers at Waseda University in Tokyo, Japan, have developed a robotic rat called WR-3 whose job is to induce stress and depression in lab animals, creating models of psychological conditions on which new drugs can be tested.

Animal are used throughout medicine as models to test treatments for human conditions, including mental disorders like depression. Rats and mice get their sense of smell severed to induce something like depression, or are forced to swim for long periods, for instance. Other methods rely on genetic modification and environmental stress, but none is entirely satisfactory in recreating a human-like version of depression for treatment. Hiroyuki Ishii and his team aim to do better with WR-3.

(Image: Takanishi Lab/Waseda University) 

The researchers tested WR-3's ability to depress two groups of 12 rats, measured by the somewhat crude assumption that a depressed rat moves around less. Rats in group A were constantly harassed by their robot counterpart, while the other rats were attacked intermittently and automatically by WR-3, whenever they moved. Ishii's team found that the deepest depression was triggered by intermittent attacks on a mature rat that had been constantly harassed in its youth.

The team say they plan to test their new model of depression against more conventional systems, like forced swimming.

The robot has been developed just as new research by Junhee Seok of Stanford University in Palo Alto, California, and colleagues shows that the use of mouse models for human conditions has led researchers trying to find treatments for sepsis, burns and trauma astray at a cost of billions of tax dollars.

Journal reference: Advanced Robotics, DOI: 10.1080/01691864.2013.752319

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Thailand warns of possible threat to US consulate

BANGKOK: Thailand said on Tuesday that it had tightened security around the US consulate in the northern city of Chiang Mai in response to warnings of a possible terrorist threat.

Prime Minister Yingluck Shinawatra said she had "instructed security officials to step up security protection" at the diplomatic facility.

"The US embassy did not make any special request but we have to be vigilant and cannot be reckless," she told reporters.

A Thai senior intelligence official who did not want to be named said the government had received information late last week about a possible threat.

"We have learned that Al-Qaeda linked Salafists (ultra-orthodox Islamists) may be planning an attack on the US consulate in Chiang Mai," he told AFP.

"It's difficult to find them because there are a lot of tourists in Chiang Mai and also it's hard for them to find weapons to mount an attack," he said.

The heightened security comes as Thailand and the United States stage 11 days of annual joint military exercises known as Cobra Gold.

A spokesman for the US embassy in Bangkok, Walter Braunohler, declined to comment on the reported threat but said the consulate in Chiang Mai was open as usual.

"We continue to take every precaution necessary," he added.

- AFP/al

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Defiant North Koreans hail third nuclear blast

STORY HIGHLIGHTS

• NEW: China says it "resolutely opposes" the nuclear test


• Obama calls the test "highly provocative," calls for "swift" international action


• North Korea confirms it carried out a more powerful test


• The test is "a significant step forward" for the North's program, an analyst says

Hong Kong (CNN) -- North Korea said Tuesday that it had conducted a new, more powerful underground nuclear test using more sophisticated technology, jolting the already fragile security situation in Northeast Asia and drawing condemnation from around the globe.

It is the first nuclear test carried out under the North's young leader, Kim Jong Un, who appears to be sticking closely to his father's policy of building up the isolated state's military deterrent to keep its foes at bay, shrugging off the resulting international condemnation and sanctions.

What happens with an underground nuclear test?

Although Pyongyang had announced plans for the test in recent, vitriolic statements, its decision to go ahead with it provided a stark reminder of a seemingly intractable foreign policy challenge for President Barack Obama ahead of his State of the Union address later Tuesday.

The test was designed "to defend the country's security and sovereignty in the face of the ferocious hostile act of the U.S.," the North's state-run Korean Central News Agency (KCNA) said, referring to new U.S.-led sanctions on Pyongyang in the wake of a recent long-range rocket launch.

Why is North Korea obsessed with rockets?

The nuclear test Tuesday, which follows previous detonations by the North in 2006 and 2009, had greater explosive force and involved the use of a smaller, lighter device, KCNA reported.

North Korea's nuclear program is shrouded in secrecy, so it's almost impossible to independently verify many of the details of the test. But its claims play into fears among the United States and its allies that Pyongyang is moving closer to the kind of miniaturized nuclear device that it can mount on a long-range missile.

Despite the North's claims of progress Tuesday, analysts say they believe it is still years away from having the technology to deliver a nuclear warhead on a missile.

"This test isn't going to do that in and of itself, but it is a significant step forward," said Mike Chinoy, a senior follow at the University of Southern California's U.S.-China Institute.

Condemnation from world leaders

After Pyongyang confirmed it had gone ahead with the test in defiance of international pressure, world leaders responded with condemnation.

"This is a highly provocative act" that threatens regional stability, breaches U.N. resolutions and increases the risk of proliferation, Obama said in a statement.

Five things to know about North Korea's planned nuclear test

"North Korea's nuclear weapons and ballistic missile programs constitute a threat to U.S. national security and to international peace and security," he said, calling for "further swift and credible action by the international community."

"It is a clear and grave violation of the relevant Security Council resolutions," the office of Ban Ki-moon, the secretary-general of the United Nations, said in a statement referring to the test.

The United Nations Security Council will meet in New York on Tuesday morning to discuss the development, a security council diplomat said, declining to be identified because of U.N. protocol on such matters.

South Korea, which chairs the Security Council at the moment, said the test presented "an unforgivable threat to the Korean peninsula's peace and safety."

"North Korea should be responsible for all the serious consequences brought by such an action," said Chun Young-woo, national security adviser to South Korean President Lee Myung-bak, who is near the end of his term in office.

The China question

Perhaps the most closely watched reaction came from China, North Korea's main ally and the source of crucial economic and political support to the regime in Pyongyang.

The Chinese foreign ministry said it "resolutely opposes" the North's latest test, which it noted had taken place "despite the international community's widespread opposition."

It said it "strongly" urged North Korean officials to "to abide by their promise to denuclearize and take no further action that will worsen the situation."

Watch: China's role in Korean crisis

The real question, though, is whether Beijing will support significantly tougher measures against its smaller neighbor following the test, something it has refrained from doing in the past.

"The Chinese don't like the idea of international sanctions and coercing other countries," Chinoy said. "They still have a strategic interest in maintaining a viable separate North Korea as a buffer against a pro-U.S. South Korea, and that has only become more important as tensions between the U.S. and China have increased."

Recent opinion articles published in the state-run Chinese newspaper Global Times suggested Beijing's patience with North Korea may be wearing thin and raised the prospect of reducing support to Pyongyang.

But with fears in Beijing of what a possible collapse of the North Korean regime could bring, strong measures appear unlikely for the time being.

"I think the key with China right now is that they are necessary to a solution, but we can't expect them to solve the problem for us," said Philip Yun, executive director of the Ploughshares Fund, a U.S.-based foundation that seeks to stop the spread of nuclear weapons.

Seismic activity

Indications that the test had taken place first emerged when U.S. seismologists reported a disturbance on Tuesday morning in North Korea centered near the site of the secretive regime's two previous atomic blasts.

The area around the epicenter of the tremor in northeastern North Korea has little or no history of earthquakes or natural seismic hazards, according to U.S. Geological Survey maps.

The disturbance reported Tuesday had a magnitude of 5.1 -- upgraded from an initial estimate of 4.9 -- took place at a depth of about 1 kilometer, the USGS said.

Kim Min-seok, a spokesman for the South Korean defense ministry, said the magnitude of the "artificial tremor" suggested the size of the blast could be in the order of 6 to 7 kilotons, more powerful than the North's two prior nuclear tests.

That calculation, though, was based on the USGS's initial estimate of a 4.9-magnitude seismic disturbance, he said. A 5.1-magnitude tremor could indicate a 10 kiloton explosion.

News breaks amid key dates in Northeast Asia

The test took place at a time when several East Asian countries, including China, North Korea's major ally, are observing public holidays for the Lunar New Year, which began Sunday.

It also comes ahead of significant dates in both North and South Korea.

On Saturday, North Koreans will celebrate the birthday of Kim Jong Il, the former North Korean leader who died in December 2011 after 17 years in power and was succeeded by his son, Kim Jong Un.

Watch: What North Korea can actually do

And on February 25, the South Korea president-elect, Park Geun-hye, will take office. She had campaigned on a pledge to seek increased dialog with the North, but Pyongyang's recent moves have left her little room for maneuver.

In a statement Tuesday, Park condemned the nuclear test, saying it harmed ties between the two Koreas.

North Korea announced last month that it was planning a new nuclear test and more long-range rocket launches, all of which it said were part of a new phase of confrontation with the United States.

It made the threats two days after the United Nations Security Council had approved the broadening of sanctions on the reclusive, Stalinist regime in response to the North's launching of a long-range rocket in December that apparently succeeded in putting a satellite in orbit.

Pyongyang said it carried out the launch for peaceful purposes, but it was widely considered to be a test of ballistic missile technology.

Threats against the U.S.?

The North's recent propaganda has used words and images that imply a threat to the United States, but analysts dismiss the prospect that Pyongyang is willing or able to carry out a military attack on U.S. soil.

The latest nuclear test is worrying in military terms, Chinoy said, "but does this mean they can drop a nuclear weapon on Los Angeles? Absolutely not. The notion that they are going to target the U.S. is way off the mark."

U.S. analysts say North Korea's first bomb test, in October 2006, produced an explosive yield at less than 1 kiloton (1,000 tons) of TNT. A second test in May 2009 is believed to have been about two kilotons, National Intelligence Director James Clapper told a Senate committee in 2012.

By comparison, the bomb the United States dropped on Hiroshima in 1945 was a 15-kiloton device.

The North's latest test on Tuesday suggests they have made a notable step forward in terms of power, said Jeffrey Lewis, East Asia director at the James Martin Center for Nonproliferation Studies, part of the Monterey Institute of International Studies.

"They were pretty clear they were going to up the yield a lot," Lewis said, and it "looks like they've done that."

He also warned that Kim Jong Un's regime may not be ready to relinquish the headlines yet, suggesting that a second test remained a possibility and could potentially happen within a few days.

In a commentary last week, the North's KCNA said that Pyongyang had "drawn a final conclusion that it will have to take a measure stronger than a nuclear test to cope with the hostile forces' nuclear war moves."

It didn't elaborate on what would be stronger than a nuclear test.

CNN's Jethro Mullen reported and wrote from Hong Kong. CNN's K.J. Kwon in Seoul, South Korea; Yoko Wakatsuki and Junko Ogura in Tokyo; Judy Kwon in Hong Kong; Dana Ford and Matt Smith in Atlanta, Georgia; Anna Maja Rappard in New York; and Elise Labott in Washington contributed to this report. Journalists Katie Hunt in Hong Kong and Connie Young in Beijing also contributed reporting.

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State of the Union guests reflect nation's hot-button issues

Several lawmakers are bringing special guests to President Obama's State of the Union address Tuesday night in order to make a statement.

Several lawmakers are bringing guests to help underscore the importance of gun control. More than 20 House Democrats are bringing guests who have been personally affected by gun violence. A bipartisan pair of Arizona lawmakers, meanwhile, will host former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly.

Other lawmakers are bringing guests tied to issues like immigration and voting rights.

Below is a partial list of officials and the guests they are bringing. CBS News will update the list as more guests are confirmed:

First Lady Michelle Obama:

• Lt. Brian Murphy, who was wounded while responding to the Sikh Temple shooting last August in Oak Creek, Wisconsin. He was struck by 15 bullets.
• Cleopatra Cowley-Pendleton and Nathaniel Pendleton Sr., parents of 15-year-old Hadiya who was killed in a Chicago park.
• Desiline Victor, a 103-year-old Florida woman who waited in line for several hours to vote.
• Tim Cook, CEO of Apple.

House Minority Leader Pelosi:

• Mother and daughter from Newtown, Conn. The 4th grader sent Pelosi a letter asking for her support to strengthen gun laws in the wake of the Sandy Hook massacre.

Sen. John McCain, R-Ariz., and Rep. Ron Barber, D-Ariz.:

• Former Rep. Gabrielle Giffords, D-Ariz., and her husband Mark Kelly

Rep. Steve Stockman, R-Texas:

• Musician and gun advocate Ted Nugent

Sens. Richard Blumenthal, D-Conn., and Chris Murphy, D-Conn.:

• First Selectwoman Pat Llodra, a Republican and the Chief Executive Officer of Newtown
• Newtown Detectives Jason Frank and Dan McAnaspie, two of several first responders who rushed to Sandy Hook Elementary School on the day of the tragedy

Rep. Luis Gutierrez, D-Ill.:

• Undocumented immigrant Gabino Sanchez. The South Carolina husband and father of two U.S. citizen children is fighting deportation. Sanchez entered the country when he was 15 years old and has been working and living peacefully in the U.S. ever since.

Sen. Dianne Feinstein, D-Calif.:

• Josh Stepakoff, who in 1999 was shot at the North Valley Jewish Community Center in Granada Hills, Calif. Stepakoff, now 20, is a student at California State University Northridge.

Sen. Frank Lautenberg, D-N.J.:

• Matt Gross, a New Jersey native who was shot in the head in 1997, at the age of 27. Gross was one of several victims wounded during a shooting attack on the observation deck of the Empire State Building.

More House Democrats bringing guests affected by gun violence:

Rep. Jim Langevin, R.I.

Rep. Keith Ellison, Minn.

Rep. Carolyn McCarthy, N.Y.

Rep. Rosa DeLauro, Conn.

Rep. David Cicilline, R.I.

Rep. Diana DeGette, Colo.

Rep. Tammy Duckworth, Ill.

Rep. Elizabeth Esty, Conn.

Rep. Lois Frankel, Fla.

Rep. Lujan Grisham, N.M.

Rep. Janice Hahn, Calif.

Rep. Jim Himes, Conn.

Rep. Alan Lowenthal, Calif.

Rep. Gloria Negrete-McLeod, Calif.

Rep. Eleanor Holmes Norton, D.C.

Rep. Ed Perlmutter, Colo.

Rep. Jan Schakowsky, Ill.

Rep. Brad Schneider, Ill.

Rep. Bobby Scott, Va.

Rep. Mike Thompson, Calif.

Rep. Krysten Sinema, Ariz.

Rep. Chris Van Hollen, Md.

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North Korea Says it Has Conducted a Nuclear Test

North Korea says it has successfully tested a miniaturized nuclear device Tuesday, according to state media.

A large tremor measured at magnitude 4.9 was detected in North Korea and governments in the region scrambled to determine whether it was a nuclear test that the North Korean regime has vowed to carry out despite international protests.

Official state media said the test was conducted in a safe manner and is aimed at coping with "outrageous" U.S. hostility that "violently" undermines the North's peaceful, sovereign rights to launch satellites. Unlike previous tests, North Korea used a powerful explosive nuclear bomb that is smaller and lighter, state media reported.

President Obama called the test "a highly provocative act" in a statement Tuesday morning.

"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies,"Obama said.

"The United States remains vigilant in the face of North Korean provocations and steadfast in our defense commitments to allies in the region," he added.

The U.N. Security Council will hold an emergency meeting on North Korea's nuclear test later this morning.

Suspicions were aroused when the U.S. Geological Survey said it had detected a magnitude 4.9 earthquake Tuesday in North Korea.

The Comprehensive Test Ban Treaty Organization told ABC News, "We confirm that a suspicious seismic event has taken place in North Korea."

North Korea Threatens More Nuclear Tests, Warns U.S. Watch Video

"The event shows clear explosion-like characteristics and its location is roughly congruent with the 2006 and 2009 DPRK (North Korea) nuclear tests," said Tibor Toth, executive secretary of the organization.

"If confirmed as a nuclear test, this act would constitute a clear threat to international peace and security, and challenges efforts made to strengthen global nuclear disarmament and non-proliferation," Toth said in a statement on the organization's web site.

Kim Min-seok, a South Korean Defense Ministry spokesman, told reporters that North Korea informed United States and China that it intended to carry out another nuclear test, according to the AP. But U.S. officials did not respond to calls from ABC News Monday night.

The seismic force measured 6 to 7 kilotons, according to South Korea.

"Now that's an absolutely huge explosion by conventional terms. It's a smallish, but not tiny explosion by nuclear terms. It's about two-thirds the size of the bomb that the U.S. dropped on Hiroshima," James Acton, a Senior Associate at the Carnegie Endowment for International Peace, told ABC News.

North Korea threatened in January to carry out a "higher-level" test following the successful Dec. 12 launch of a long range rocket. At the time, North Korea's leader Kim Jong-Un said his country's weapons tests were specifically targeting the United States.

The suspicious tremor comes just hours before President Obama is to give the State of the Union address, and it marks the first diplomatic test in the region for new Secretary of State John Kerry.

Also, South Korea's new president, Park Geun-hye, is scheduled to be sworn in on Feb. 25. One of North Korea's biggest holidays, Kim Jong-il's birthday, falls on Feb. 16.

China, North Korea's main ally in the region, has warned North Korea it would cut back severely needed food assistance if it carried out a test. Each year China donates approximately half of the food North Korea lacks to feed its people and half of all oil the country consumes.

Both of North Korea's previous tests used a plutonium-based method for making bomb fuel. The first was deemed a failure, the second only slightly less so. If the most recent test used HEU (highly enriched uranium), a far more difficult-to-detect method of producing bomb fuel, it would be a significant and worrisome step forward for North Korea's weapons program.

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Can the internet revive US democracy?

Jim Giles, consultant

Tech-savvy campaigns get mixed results, as the Arab Spring shows (Image: William Dupuy/Picturetank)

Gavin Newsom's Citizenville shows that technology can empower people, but the book fails to explore deep-rooted problems within the democratic process

THERE'S a lot of crime in Oakland, California. But until a few years ago, citizens had little way of assessing the scale of the problem. Then Michal Migurski hurt his back. It was Christmas 2006 and Migurski, a computer programmer, was stuck at home in Oakland, looking for ways to use his time until his back healed. He knew about the area's crime problem and decided to create an online map showing where and when crimes had been committed - something local government had failed to do.

Migurski's crimespotting.org website gets enthusiastic coverage in Gavin Newsom's Citizenville, a homage to technology's ability to empower people and reform government. If committed and skilled citizens like Migurski can access official data, for example, they can create services that governments don't have time for or aren't well equipped to provide. The internet has already disrupted a swathe of industries, from journalism to telecommunications. Citizenville is packed with examples that show that it is government's turn.

For the book, Newsom - California's lieutenant governor - talked to a host of Silicon Valley luminaries, from Google founder Sergey Brin to Tim O'Reilly, tech publisher and one of the most high-profile advocates of the idea that technology can transform government. The result is a 239-page tribute to what the valley does best: suggest radical and scalable ways to do things better.

Unfortunately, Newsom's unfettered enthusiasm for the power of the internet and smartphones to transform social and governmental problems makes for a shallow read. Take his analysis of FarmVille, the incredibly successful Facebook game in which players run virtual farms. Why couldn't a similar game be used to help govern a real city, he asks? It's an intriguing idea, based in part on the argument put forward by Jane McGonigal, a game designer, that gaming can be used to solve real-world problems.

But doesn't FarmVille's appeal have much to do with its lack of real-life responsibility? Newsom only touches on this before rushing off to his next tech-inspired solution.

It's a frustrating approach because Newsom was mayor of San Francisco between 2003 and 2010, and rolled out some bold tech-based reforms during his tenure, so he is well placed to discuss the benefits and difficulties of applying technology to governance.

Some of the most interesting parts of Citizenville address ideas that did not work, like radical transparency. After becoming mayor, Newsom decided to post his diary on the web, until his chief of staff pointed out that fundraising meetings would be visible. Newsom relented, accepting that voters don't like to see politicians asking for money.

It's a great example of how technology is just part of the reform equation. To truly empower, technology will have to deal with many entrenched problems, ranging from the shameless distortions that most elected officials spout to the huge number of alienated people who don't register to vote. Any proper assessment of technology's power to change needs to do more than consider the solutions it offers. The impoverished democratic process in the US will not improve until the causes of this situation are part of the discussion.

Broader initiatives exist, of course. Political scientists who study how misinformation spreads have teamed up with technologists to create systems for reining in erroneous memes, like the claim that Barack Obama is not a US citizen. Public health experts are studying not just the internet's ability to communicate health information but also the extent to which that information changes behaviour. It is this kind of thinking, which accepts that technology is only part of the solution, that is missing from Citizenville. I was left wishing that Newsom had focused on just a few of the issues he writes about, and had taken his research beyond the confines of Silicon Valley.

This article appeared in print under the headline "There is no app for political reform"

Book information:
Citizenville: How to take the town square digital and reinvent government by Gavin Newsom and Lisa Dickey
Penguin
$25.95

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Police face flak over Kumbh Mela tragedy as organiser quits

ALLAHABAD, India : Survivors of a stampede that killed 36 people at India's Kumbh Mela on Monday blamed the tragedy on baton-charging police and the slow response of medics as the massive festival's chief organiser resigned.

The crush at a train station on Sunday evening at Allahabad marked a tragic end to the most auspicious day of the 55-day Hindu festival in the state of Uttar Pradesh which had drawn some 30 million people.

Local officials said the railings on a bridge at the station had given way, while witnesses said police had charged the crowd with heavy wooden sticks known as lathis and triggered panic among pilgrims leaving the world's biggest gathering.

"I saw the police pushing the crowd and they were ... beating the pilgrims," Abhijit Das, a 29-year-old pilgrim from West Bengal who was at the station when the disaster happened, told AFP.

There was also criticism of the response to the disaster, with relatives recounting how the emergency services took hours to reach the scene. At least 10 corpses wrapped in white sheets could be seen on a platform several hours later.

Among the victims was an eight-year-old girl called Muskaan whose distraught parents said she had died while waiting nearly two hours for help.

"Our daughter still had a pulse. Had the doctors reached in time she would have been saved, but she died before our eyes," Bedi Lal, the child's father, told the NDTV news channel.

Speaking from his hospital bed after suffering leg injuries, Shashi Bhaduri recounted the mayhem at the scene.

"Suddenly there were at least a hundred people on top of me. My legs are so badly injured that I cannot even lift them now," he said.

Apart from Muskaan, the dead included 26 women and nine men.

After the state government ordered an investigation into the tragedy, one of the driving forces behind the festival said he was resigning as a matter of honour.

"I have resigned as the chairman of the festival committee," said Mohammad Azam Khan, who is also a cabinet minister in the state.

"Although the stampede happened beyond the scope of my jurisdiction, I am deeply disturbed and step down on moral grounds," he told AFP.

Hindus believe a dip in the sacred waters of the River Ganges cleanses them of their sins. This year's Mela is enormous even by previous standards, with astrologers saying a planetary alignment seen once every 147 years made it particularly auspicious.

Police had been stretched in controlling the vast crowds as they reached their peak on Sunday, with officials saying the numbers had passed the 30 million mark by the evening.

A spokesman for the state government said the crush began after joints broke on railings attached to the bridge.

Railways Minister Pawan Kumar Bansal attributed the accident to the sheer weight of numbers at the train station.

"There are limitations of a railway system," he told reporters. "Even if we have trains at 10-minute intervals, managing three crore (30 million) people may not be possible."

Asked about the police tactics, the minister said: "We have no evidence of lathi-charge."

The Kumbh Mela, which began last month and ends in March, takes place every 12 years in Allahabad while smaller events are held every three years in other locations around India.

In 2003, 45 people died in a stampede during the festival in the western town of Nasik.

At the Kumbh Mela on Sunday, 30,000 volunteers and 7,000 police were on duty, urging pilgrims to take one short bath and then leave the waters to make space for the flow of humanity that stretched for kilometres.

The event has its origins in Hindu mythology, which describes how a few drops of the nectar of immortality fell on the four places that host the festival - Allahabad, Nasik, Ujjain and Haridwar.

- AFP/ms

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5 arrested in Mexico tourist rapes

By Jessica King and Salomon Kaufman, CNN

updated 2:52 AM EST, Mon February 11, 2013

STORY HIGHLIGHTS

• 50 investigators are working the case


• An official says investigators are pursuing strong leads


• Six Spanish women were allegedly raped

Acapulco, Mexico (CNN) -- Mexican authorities are holding five suspects in connection with the alleged rapes of six Spanish tourists in Acapulco, Guerrero state Gov. Angel Aguirre Rivero said Sunday.

The state attorney general has not yet released any information on the suspects or where they're being held, prompting demonstrations by family members concerned about their whereabouts.

Fifty investigators have been dedicated to the case.

The six women were among 14 people victimized by hooded gunmen who burst into a beach bungalow in the resort town before dawn February 4. There are seven suspects between the ages of 20 and 30, lead investigator Marcos Juarez said.

In addition to the rapes, the men stole cell phones, iPads and tennis shoes from the victims, investigators said.

Investigators believe the victims bought drugs from one or more of the suspects a day or two earlier, and that the victims knew the suspects, Juarez said last week.

The Spanish nationals range from ages 20 to 34 and are under the protection of Mexican authorities in Mexico City.

Rape case in Mexican resort city puts violence back in the spotlight

Seven men who were with the group were tied up with cell phone cables and bikini straps while the gunmen assaulted the six women, officials said.

A seventh woman, a Mexican, was spared because of her nationality, Guerrero state Attorney General Martha Garzon said in a radio interview Wednesday.

"She has said that she identified herself to the men and asked them not to rape her," Garzon told Radio Formula. "And they told her that she had 'passed the test' by being Mexican, and from that point they don't touch her."

The gunmen's motive was robbery and "to have some fun," as they saw it, Garzon said. They do not appear to be a part of organized crime, officials said.

Military checkpoints have been set up to apprehend the suspects.

As they sift through evidence, investigators have cordoned off the area around the bungalow, which is in Playa Encantada.

Last year, the city of Acapulco attracted half a million tourists -- most of them Mexicans.

Mexico's Foreign Ministry said in a statement that the Spanish tourists received consular aid after the incident.

The U.S. State Department says "resort areas and tourist destinations in Mexico generally do not see the levels of drug-related violence and crime reported in the border region and in areas along major trafficking routes."

But the agency adds that resort city bars, including those in Acapulco, can be "havens for drug dealers and petty criminals."

Salomon Kaufman reported from Acapulco, and Jessica King reported from Atlanta.

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New England, N.Y. face first post-blizzard rush hour

NEWPORT, R.I. As electricity returns and highways reopen, Northeast residents are getting back to their weekday routines following the massive snowstorm that had millions digging out from New York to Maine.

But the routine for some New Englanders will be disrupted by school and workplace closings, while residents of New York's Long Island anticipate the reopening of a major roadway. For some, there's also a new worry: the danger of roof collapses as rain and warmer weather melt snow.

The storm that slammed into the region with up to three feet of snow was blamed for at least 15 deaths in the Northeast and Canada, and brought some of the highest accumulations ever recorded.

Still, coastal areas were largely spared catastrophic damage despite being lashed by strong waves and hurricane-force wind gusts at the height of the storm.

Hundreds of people, their homes without heat or electricity, were forced to take refuge in emergency shelters set up in schools or other places.

61 Photos

Powerful blizzard descends on Northeast

Utility crews, some brought in from as far away as Georgia, Oklahoma and Quebec, raced to restore power. By early Monday, region-wide outages had dropped from some 650,000 in eight states at their highest to 149,970 -- more than 126,000 of them in Massachusetts, where officials said some of the outages might linger until Tuesday.

"For all the complaining everyone does, people really came through," said Rich Dinsmore, 65, of Newport, R.I., who was staying at a Red Cross shelter set up in a middle school in Middletown after the power went out in his home on Friday.

Dinsmore, who has emphysema, was first brought by ambulance to a hospital after the medical equipment he relies on failed when the power went out and he had difficulty breathing.

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Northeast sees record snow fall

"The police, the fire department, the state, the Red Cross, the volunteers, it really worked well," said the retired radio broadcaster and Army veteran.

President Obama declared a state of emergency for Connecticut, allowing federal aid to be used in recovery.

CBS News correspondent Miguel Bojorquez reports that Hamden, Conn., about 80 miles from New York City, got the deepest snow: 40 inches. The blizzard dumped five inches of snow per hour there for some time.

Driving bans were lifted and flights resumed at major airports in the region that had closed during the storm, though many flights were still canceled Sunday. Public transit schedules were being restored.

The Boston-area public transportation system, which shut down on Friday afternoon, was expected to resume full service on Monday, albeit with delays.

Massachusetts Bay Transit Authority (MBTA) General Manager Beverly Scott, speaking at a Sunday afternoon press conference, noted that snow accumulation, downed tree limbs and other damage from high winds and the overall age of the transit system made restoration challenging, reports CBS Boston station WBZ.

The Metro-North Railroad expected to resume much of its train service on its New York and Connecticut routes while the Long Island Rail Road said commuters could expect a nearly normal schedule.

"A lot of progress has been made," said Salvatore Arena, a spokesman for the Metropolitan Transportation Authority, which operates Metro-North.

Some public schools canceled classes on Monday, including in Boston, Providence and on Long Island, while local governments in some areas told non-essential workers to take the day off.

On eastern Long Island, the harrowing images from New York's slice of the massive snowstorm -- people stranded overnight, cars abandoned on long stretches of drift-covered highways -- were slowly erased Sunday as hundreds of snowplows and heavy equipment descended to try to help clear the way for Monday's commute.

Long Island was slammed with as much as 30 inches of snow, which shut down roads, including the Long Island Expressway. A 27-mile stretch of the road was closed Sunday and early Monday for snow-removal work.

Gov. Andrew Cuomo said more than a third of all the state's snow-removal equipment was sent to the area, including more than 400 plow trucks and more than 100 snow blowers, loaders and backhoes.

"The massive amount of snow left behind effectively shut down the entire region," Cuomo said.

On Sunrise Highway, which runs parallel to the Long Island Expressway, Dennis Lawrence, of Bellport, N.Y., had already spent 90 minutes digging out the car he had abandoned and had at least another 30-60 minutes to go on Sunday. He left it there Friday after getting stuck on his way home from his job in New York City.

"The car was all over the place, it just slid over and wouldn't move," the 54-year-old elevator mechanic said. "I finally decided today to come and get it."

Boston recorded 24.9 inches of snow, making it the fifth-largest storm in the city since records were kept. The city was appealing to the state and private contractors for more front-end loaders and other heavy equipment to clear snow piles that were clogging residential streets.

The National Weather Service was forecasting rain and warmer temperatures in the region on Monday, which could begin melting some snow but also add considerable weight to snow already piled on roofs, posing the danger of collapse. Of greatest concern were flat or gently-sloped roofs and officials said people should try to clear them -- but only if they could do so safely.

"We don't recommend that people, unless they're young and experienced, go up on roofs," said Peter Judge, spokesman for the Massachusetts Emergency Management Agency.

In Middlefield, Conn., two cows were killed when the roof of a barn gave way under the weight of heavy snow, one of two such incidents in the state that prompted agriculture officials to issue an advisory to farmers.

Officials also continued to warn of carbon monoxide dangers in the wake of the storm.

In Boston, two people died Saturday after being overcome by carbon monoxide while sitting in running cars, including a teenager who went into the family car to stay warm while his father shoveled snow. The boy's name was not made public. In a third incident, two children were hospitalized but expected to recover. In Webster, a 60-year-old off-duty member of the Worcester Fire Department died Saturday after suffering a heart attack while clearing snow at his home.

A fire department spokesman said in each case, the tailpipes of the cars were clogged by snow.

In Maine, the Penobscot County Sheriff's office said it recovered the body of a 75-year-old man who died after the pickup he was driving struck a tree and plunged into the Penobscot River during the storm. Investigators said Gerald Crommett apparently became disoriented while driving in the blinding snow.

Christopher Mahood, 23, of Germantown, N.Y., died after his tractor went off his driveway while he was plowing snow Friday night and rolled down a 15-foot embankment.

In Massachusetts, eight teams were formed to assess damage from flooding along the state's coastline, with the hardest hit-areas including historic Plymouth and portions of Cape Cod.

"Considering the severity of the storm, the amount of snow and the wind, we've come through this pretty well," Gov. Deval Patrick told the CBS News broadcast "Face The Nation" Sunday after meeting with local officials in Plymouth.

The U.S. Postal Service said that mail delivery that was suspended in the six New England states, as well as parts of New York and New Jersey, because of the snowstorm would resume Monday, where it is safe to do so.

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Time to rinse! AI assistant helps clean your teeth

FOR most of us, brushing our teeth is just a tedious part of the daily grind. But for people with dementia or learning difficulties, such tasks can be difficult. They could soon gain more independence thanks to an AI designed by Christian Peters at Bielefeld University in Germany and his colleagues.

Peters has already come up with a system that guides people when washing their hands. Brushing teeth is more complicated because it involves many steps - such as putting toothpaste on the brush, filling a glass with water or rinsing the mouth.

The TEBRA system uses a video camera to monitor someone brushing their teeth and checks that each step happens at the right time. It prompts them via a screen on the washstand if they forget a step or if they get stuck. The idea is not to dictate a routine, but to adapt to that of the user, says Peters.

TEBRA is being tested at a care home in Bielefeld for people with learning disabilities. Caregivers there reported that the system was less distracting for some people than a human carer. The work will be presented at the International Conference on Health Informatics in Barcelona, Spain, next week. Peters also plans to adapt his system to tasks such as shaving.

This article appeared in print under the headline "Time to rinse! An AI to help you clean your teeth"

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