Signs of runaway heat seen in Dreamliner batteries

TOKYO An investigation into a lithium ion battery that overheated on a Boeing 787 flight in Japan last month found evidence of the same type of "thermal runaway" seen in a similar incident in Boston, officials said Tuesday.

The Japan Transportation Safety Board said that CAT scans and other analysis found damage to all eight cells in the battery that overheated on the All Nippon Airways 787 on Jan. 16, which prompted an emergency landing and probes by both U.S. and Japanese aviation safety regulators.

They also found signs of short-circuiting and "thermal runaway," a chemical reaction in which rising temperature causes progressively hotter temperatures. U.S. investigators found similar evidence in the battery that caught fire last month on a Japan Airlines 787 parked in Boston.

Photos distributed by the Japanese investigators show severe charring of six of the eight cells in the ANA 787's battery and a frayed and broken earthing wire — meant to minimize the risk of electric shock.

All 50 Boeing 787s in operation are grounded as regulators and Boeing investigate the problem. The Japanese probe is focusing on flight data records and on the charger and other electrical systems connected to the damaged battery.

Lithium ion batteries are more susceptible to catching fire when they overheat or to short-circuit than other types of batteries. Boeing built in safeguards to gain safety certification for use of the relatively light and powerful batteries to power various electrical systems on the 787, the world's first airliner made mostly from lightweight composite materials.

Investigators earlier said they found no evidence of quality problems with production of the 787's batteries by Kyoto, Japan-based, GS Yuasa, whose own aerospace ambitions are on the line.

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Sarai Sierra's 2 Young Boys Don't Know Mom's Dead

The two young sons of slain New York mom Sarai Sierra are under the impression that their father has gone to Turkey to bring their mother home - alive.

Sierra, whose battered body was found near a highway in Istanbul over the weekend, was the mother of two boys aged 9 and 11.

Steven Sierra, who went to Istanbul in search of his wife after she disappeared nearly two weeks ago, told his children that he was going to Turkey to bring their mom home.

"The father will be speaking to them and it's something that's going to be hard and he's going to be talking to them when he comes back," Betsy Jimenez, the mother of Sarai Sierra, said today during a family news conference.

State Representative Michael Grimm said Steven Sierra's biggest concern is telling his children that mom's not coming home.

"It's going to be the hardest thing he's ever going to have to do in his life," said Grimm, who added that the Staten Island family isn't sure when Steven Sierra will be able to bring home his wife's body.

An autopsy was completed Sunday on Sarai Sierra, 33, but results aren't expected for three months. Turkish officials however said she was killed by at least one fatal blow to her head.

A casket holding the Staten Island mother was carried through alleyways lined with spice and food stalls to a church, where the casket remained on Monday.

Turkish police hope DNA samples from 21 people being questioned in the case will be key to finding the perpetrators, the Associated Press reported, according to state run media.

Sarai Sierra's Body Found: Missing New York Mom Found in Turkey Watch Video

Body Found in Search for Missing Mother in Turkey Watch Video

Vanished Abroad: US Woman Missing in Turkey Watch Video

Earlier this week, it was also reported that Turkish police are speaking to a local man who was supposed to meet Sierra the day she disappeared, but he said she never showed.

After an intense search for Sierra that lasted nearly two weeks, her body was found Saturday near the ruins of some ancient city walls and a highway. Sierra was wearing the same outfit she was seen wearing on surveillance footage taken at a food court and on a street the day she vanished, Istanbul Police Chief Huseyin Capkin said.

Sierra's body was taken to a morgue, Capkin said, and was identified by her husband.

It did not appear she had been raped or was involved in any espionage or trafficking, Capkin said.

Betsy Jimenez said Monday that her family has many unanswered questions such as what happened to her daughter after she left her hotel room to go and take photographs of a famous bridge.

"They're still investigating so they might think it might be a robbery, but they're not sure," said Jimenez.

Sierra, who had traveled to Istanbul on Jan. 7 to practice her photography hobby, was last heard from on Jan. 21, the day she was due to board a flight home to New York City.

Dennis Jimenez, Sierra's father, told reporters Monday that he didn't want her to go on the trip.

"I didn't want her to go. But, she wanted to go because this was an opportunity for her to sightsee and pursue her photography hobby because Turkey was a land rich with culture and ancient history and she was fascinated with that," said Jimenez.

While in Istanbul, Sierra would Skype with her family and friends daily, telling them about how amazing the culture was.

Sierra's best friend Maggie Rodriguez told ABC News that she was forced to pull out of the trip at the last minute because she couldn't afford it. That's why Sierra traveled alone.

Her husband, Steven Sierra, and brother, David Jimenez, traveled to Istanbul last Sunday to meet with American and Turkish officials and push the search forward.

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Bug protects itself by turning its environment to gold

Mythical King Midas was ultimately doomed because everything he touched turned to gold. Now, the reverse has been found in bacteria that owe their survival to a natural Midas touch.

Delftia acidovorans lives in sticky biofilms that form on top of gold deposits, but exposure to dissolved gold ions can kill it. That's because although metallic gold is unreactive, the ions are toxic.

To protect itself, the bacterium has evolved a chemical that detoxifies gold ions by turning them into harmless gold nanoparticles. These accumulate safely outside the bacterial cells.

"This could have potential for gold extraction," says Nathan Magarvey of McMaster University in Hamilton, Ontario, who led the team that uncovered the bugs' protective trick. "You could use the bug, or the molecules they secrete."

He says the discovery could be used to dissolve gold out of water carrying it, or to design sensors that would identify gold-rich streams and rivers.

The protective chemical is a protein dubbed delftibactin A. The bugs secrete it into the surroundings when they sense gold ions, and it chemically changes the ions into particles of gold 25 to 50 nanometres across. The particles accumulate wherever the bugs grow, creating patches of gold.

Deep purple gold

But don't go scanning streams for golden shimmers: the nanoparticle patches do not reflect light in the same way as bigger chunks of the metal – giving them a deep purple colour.

When Magarvey deliberately snipped out the gene that makes delftibactin A, the bacteria died or struggled to survive exposure to gold chloride. Adding the protein to the petri dish rescued them.

The bacterium Magarvey investigated is one of two species that thrive on gold, both identified a decade or so ago by Frank Reith of the University of Adelaide in Australia. In 2009 Reith discovered that the other species, Cupriavidus metallidurans, survives using the slightly riskier strategy of changing gold ions into gold inside its cells.

"If delftibactin is selective for gold, it might be useful for gold recovery or as a biosensor," says Reith. "But how much dissolved gold is out there is difficult to say."

Journal reference: Nature Chemical Biology, DOI: 10.1038/NCHEMBIO.1179

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Population White Paper for benefit of all Singaporeans: DPM Teo

SINGAPORE: Deputy Prime Minister Teo Chee Hean has presented in Parliament the White Paper on Population, a roadmap to address Singapore's demographic challenges.

The Land Use Plan was presented along with the White Paper.

The White Paper comes on the back of a shrinking and greying population in Singapore.

The minister's speech delved straight into addressing the concerns Singaporens have raised over the past week following the White Paper's release.

First, the projected population of 6.9 million by 2030.

Mr Teo said the White Paper in fact is proposing a major shift - a significant slowdown in Singapore's rate of workforce and population growth.

For example, population growth rate is in fact projected to drop to about half the historical growth rate.

He added the government is not deciding on a population of 6.9 million by 2030.

The figure, he stressed, is only to prepare infrastructure plans.

What the population will be like in 2030, he said, will depend on the needs of Singaporeans.

"It is the ability to meet the needs of Singaporeans and provide a good quality of life that is the drive, that's our objective. It's not the numbers per se. If we are able to achieve all that with a smaller population, whether 6.5 million or lower, there is no reason to go higher, but it's prudent to plan our infrastructure at the upper end of the range so we don't get caught up," said Mr Teo.

- CNA/ir

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Five sizzling Super Bowl moments to talk about

Ray Lewis of the Baltimore Ravens celebrates after defeating the San Francisco 49ers during Super Bowl XLVII. The Ravens defeated the 49ers, 34-31.

STORY HIGHLIGHTS

• The game came down to a controversial play in the end zone


• Women with amazing vocals inspired and entertained


• Jacoby Jones scores two remarkable touchdowns


• Some commercials touched hearts, others were meh

(CNN) -- It may not have been a great game until after the lights went out and came back up, but the Super Bowl showdown Sunday night created quite a few memorable moments on the field and off, even before kickoff.

There were powerful performances, including a much buzzed-about halftime show by superstar Beyonce.

But there was also a lack of electricity in the stadium and in some of the commercials.

And San Francisco 49ers fans are sure to get emotional over that last play they ran on offense, when two players met in the end zone and despite contact, no penalty was called.

Here are the five moments you can expect your coworkers to talk about Monday morning.

Grrrl Power

The men may have duked it out during the game. But when it came to the non-football entertainment at the Superdome, women ruled the day.

First up was Jennifer Hudson with a stirring rendition of "America the Beautiful." The choir backing her comprised of students from Sandy Hook Elementary, the Connecticut school where 20 students and six school staff were shot dead in December.

Players on the sidelines and fans on the stand wiped away tears.

"Our wish is to demonstrate to America and the world that, 'We are Sandy Hook and We Choose Love,'" the choir said in a statement.

Next, Alicia Keys belted out the "Star-Spangled Banner" as the children, in white polo shirts with green ribbons pinned to them, stood with their hands on their hearts.

"It's football. But I just cried," tweeted actor Brian Baumgartner about the Sandy Hook performance.

The big show, however, came once the 49ers and the Baltimore Ravens got through the first half.

Welcome, Beyonce.

For 12 minutes, she rocked the stage clad in above-the-knee black stiletto boots and a leather minidress.

Powered by an all-female backing band, there was little doubt Beyonce sang live -- unlike during President Barack Obama's inauguration last month where she admitted singing along to a prerecorded track.

And as if that wasn't enough girl power for the night, Beyonce was joined by her Destiny's Child bandmates, Kelly Rowland and Michelle Williams.

"My heart just stopped," tweeted actress Mindy Kaling.

She wasn't the only one. Beyonce's performance generated 5.5 million tweets!

Lack of power

For the first two quarters, the Ravens seemed unstoppable, steamrolling the 49ers to a 28-6 lead.

But then, half the lights in the Superdome went mysteriously black.

The NFL released a statement saying it was "investigating." The power company said it was not to blame and that electricity in the rest of the city was fine.

The outage left players, coaches and fans to wait, wait and wait some more.

Social media lit up.

After 35 minutes when the lights slowly went back on, so did San Francisco -- prompting many to wonder if the break in play played to the 49ers advantage.

Running back Frank Gore felt differently.

"You have to wait. Football is a game of adjustments. The elements don't matter," he told NFL.com. "I've been saying it all year, the elements don't matter in football. You've just got to learn how to make adjustments."

The real MVP?

Quarterbacks often get the glory in the Super Bowl, but wide receiver Jacoby Jones had a strong case for Most Valuable Player. He lost out to Joe Flacco.

Jones scored on two of the most incredible plays in Super Bowl history, including a record 108-yard kickoff return. It took him just 11 seconds on the clock to slice through the 49ers coverage team.

"Jacoby's been a blessing to this team," said Ravens coach John Harbaugh. "We're grateful to have him on this team."

Jones, who grew up in New Orleans, also caught a 56-yard touchdown pass -- his only reception. He fell, got up, decked a defender and sprinted at an angle toward the goal line, beating two 49ers into the end zone.

"Everybody dreams of scoring a touchdown in the Super Bowl. But two of 'em? That's what's up!" Jones told NOLA.com. "It was always a goal to win a Super Bowl. To come home and do it, that's the icing on the cake."

Jones is definitely the MVP for some Baltimoreans who bought furniture this weekend at a Baltimore store.

The Baltimore Sun reported Gardiners Furniture promised to wipe out the charges for anything purchased on Saturday or Sunday -- if the Ravens returned a kick for a touchdown to start a half.

Probably seemed like a good bet at the time.

A geek makeout makes us gag

Some of the Super Bowl commercials made us weep for different reasons.

There were quite a few that played on our sentiment, from Budweiser's "Brotherhood" to Jeep's Oprah-narrated America Will Be Whole Again" to Dodge's ode, "Farmer."

Then there was the racy GoDaddy ad that made us want to cry, burn our eyes out and have the Men in Black wipe out our memories.

In it, model Bar Refaeli shares a long kiss with a red-cheeked "nerd" that prompted its own hashtag: #NoDaddy.

"Oh my gosh those kissing noises," tweeted Chicago college student Grace Barnes.

Bleacher Report: Grading the best & worst ads

A no-call to rue until next year

Despite trailing by 22 in the second half, San Francisco nearly won it in the final minutes.

With 1:50 left, the 49ers had the ball on the Ravens 5, trailing 34-29. It was 4th and goal.

San Francisco quarterback Colin Kaepernick tossed a throw toward the right side of the end zone where the Ravens' Jimmy Smith and the Niners' Michael Crabtree made contact.

"No flag, incomplete," CBS announcer Jim Nantz said as the ball sailed over Crabtree's head. The cameras cut to a shot off 49ers coach Jim Harbaugh making the signal for holding.

Many believe it should have been a penalty on Smith.

"There's no question in my mind that there was a pass interference and then a hold on Crabtree on the last one," the 49ers coach said.

New England wide receiver Dante Stallworth tweeted there should have been a flag, even if the ball seemed like it was so high no one could catch it.

"For all y'all saying that ball was uncatchable for Crabtree in the endzone... DUH!! Because dude held thee sh*t outta him..." he tweeted.

NFL Network commentators Warren Sapp and Steve Mariucci disagreed.

Sapp said it was obviously pass interference but Mariucci, a former 49ers coach, pointed out the Crabtree also made contact, putting his hand on Smith's helmet.

Crabtree told Yahoo Sports it was "a missed call."

"I don't want to talk about it. I don't want to think about it," he said.

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Tour bus crash kills at least 8 in California

Updated 4:15 a.m.

YUCAIPA, Calif. A tour bus collided with a car and pickup truck, killing at least eight people and injuring dozens of others Sunday night on a Southern California mountain highway, authorities said.

California Highway Patrol spokesman Mario Lopez confirmed the deaths and said 38 people were taken to hospitals with injuries.

He also said the bus driver reported having brake problems as it headed down the mountain on two-lane State Route 38, rear-ending a sedan then flipping over and hitting a pickup truck that was pulling a trailer.

The bus was carrying a tour group from Tijuana, Mexico, and a representative from the Mexican consulate was at the grim crash scene, California Department of Transportation spokeswoman Michelle Profant said.

"It's really a mess up there with body parts," Profant said.

Rescuers were still searching the wreckage for victims hours later. At least two passengers were said to be trapped, reports CBS Los Angeles station KCBS-TV.

Television footage showed the bus sitting upright but turned sideways on the road.

At least seven ambulances were called to the scene, and patients were taken to several hospitals.

Arrowhead Regional Medical Center said four women had been admitted from the crash and their conditions were still being determined. Redland Community Hospital said it received one person in critical condition and one with minor injuries, while two more were en route with minor injuries. Community Hospital of San Bernardino said it had received one patient with undetermined injuries, while St. Bernadine Medical Center said it had two patients, whose injuries were being assessed.

The purpose of the tour was not immediately clear, but Highway 38 leads to Big Bear, a popular area that's home to a ski resort and other recreational locations.

Lettering on the bus indicated that it was operated by Scapadas Magicas LLC, a company based in National City, Calif. Federal transportation records show that the company is licensed to carry passenger for interstate travel and that it had no crashes in the past two years.

A call to the company was not immediately returned.

The California crash comes less than a day after a bus carrying 42 high school students and their chaperones slammed into an overpass in Boston. Massachusetts state police said 35 people were injured and that the driver had directed the bus onto a road with a height limit.

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Ravens Defeat 49ers in Historic, Unusual Super Bowl

The Baltimore Ravens emerged Super Bowl champions after one of the strangest and most incredible Super Bowl games in recent memory.

It's the second championship for the Ravens, who pulled out a 34-31 win over the San Francisco 49ers at the Superdome in New Orleans.

The Super Bowl is the biggest spectacle in American sports, and each year becomes the most watched television event in history. This year, Jennifer Hudson kicked things off with a touching performance of "America the Beautiful" with a choir of students from Sandy Hook Elementary School.

Alicia Keys accompanied herself on the piano for a long, jazzy rendition of the national anthem, before the coin toss which resulted in San Francisco receiving to start the first half.

Although the game looked at one point like it was going to be a completely unexpected blow-out, with the Ravens leading 28-6 at the beginning of the 3rd quarter, the 49ers got some unusual help that turned the showdown into a much more exciting battle.

About a third of the way into the 3rd quarter, right after a record-tying Ravens rushing touchdown, the power went out at the Superdome, knocking the lights and air conditioning out in the indoor stadium. The crowd of more than 71,000 strong, along with a lot of antsy players, coaches, and staff waited for 34 minutes for the power to fully come back on and the game to resume.

Chris Graythen/Getty Images

Super Bowl 2013: Beyonce Rocks the Halftime Show Watch Video

Super Bowl 2013: Alicia Keys Sings 'The Star-Spangled Banner' Watch Video

Super Bowl 2013: Jennifer Hudson, Sandy Hook Students Perform Watch Video

In a statement, the NFL said authorities were "investigating the cause of the power outage," and law enforcement sources told ABC News it was just an issue with the building.

That didn't stop many people on Twitter from jokingly blaming Beyonce, the energetic halftime performer who surprisingly reunited shortly with her former band Destiny's Child, for shutting down the power. After her performance, even her husband Jay-Z got in on it, tweeting "Lights out!!! Any questions??"

VIDEO: Super Bowl 2013: Beyonce Rocks the Halftime Show

The 49ers quickly followed the long delay with a touchdown, getting themselves right back into the game. Then just a few minutes later, they found themselves in the end zone again, and it appeared the power outage had flipped the momentum towards the 49ers.

With a score of 31-29 with more than 7 minutes left in the game, San Francisco looked poised to make the biggest comeback in Super Bowl history, but the team, trying for its 6th title, wasn't able to overcome the Ravens lead.

Baltimore was able to run out the clock, and the game ended with a final score of 34-31. Purple and gold confetti fell as the Ravens rushed onto the field and celebrated -- with some colorful language from quarterback Joe Flacco audible on the live broadcast, who was caught saying, "f***ing awesome" on CBS' cameras.

The game was already historic thanks to the match-up for John and Jim Harbaugh, the first head coach brothers to ever face each other on football's biggest stage. It was also the final game for the future Hall of Fame linebacker Ray Lewis, who is, as of the conclusion of the game retired from football.

This is the fifth season in a row that the Ravens have made it to the playoffs, led by Coach John Harbaugh, and SB XLVII MVP Quarterback Joe Flacco. It's the team's first Lombardi trophy since 2000. Their victor tonight made them the only team left in the NFL to have never lost a Super Bowl in multiple appearances.

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Sneaky ninja robot silently stalks its prey

MOVE over David Attenborough. A robot that moves only when it won't be seen or heard might make it easier to sneak up on animals and film them in the wild.

Defence labs have built robots that track people through cities, avoiding well-lit areas. But cities are noisy, so if a robot keeps a certain distance it's unlikely to be heard. Tracking and filming animals in the wild is tougher because they often have keen hearing and the environment is usually quieter. Matthew Dunbabin and his collaborator Ashley Tewes at the CSIRO Autonomous Systems Laboratory in Brisbane, Australia, are teaching a four-wheeled robot to move only when intermittent sounds - like bird or frog calls - will mask its movements.

In tests, the robot picked up the sounds of things like fork-lifts, cellphones and birds, and was able to predict whether they were likely to persist long enough to cover its movement. The robot can also identify its own noise, and guess how it will vary at different speeds and turning angles - calculating what this will sound like to a target up to 50 metres away.

With the help of a camera, laser scanner and the right algorithm, the robot can figure out which vantage points will provide the best cover so it can skulk in the shadows.

This article appeared in print under the headline "Sneaky ninja robot silently films its prey"

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Govt has to and will deliver high quality: K Shanmugam

SINGAPORE: Law and Foreign Affairs Minister K Shanmugam said the range of views expressed about the 6.9 million population projection set out in the White Paper are completely understandable.

He was speaking to reporters at a hong bao presentation ceremony at his Chong Pang Division.

He said businesses are unhappy about the lack of growth in the labour force but there are also those who are concerned about the 6.9 million figure.

"They say 'I have difficulties with infrastructure, transport, housing with today's population and you want to increase it even more, doesn't make sense,' - that's a reaction and it is understandable.

"The government has got to explain two points. The first is we have to and will solve the current infrastructure problems and second for this long term planning, whatever the size of the population, 6.9 million is not the target, the infrastructure must be adequate and deliver high quality of life.

"That has to be a cast iron position that the government has to deliver and will deliver," he said.

- CNA/ck

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Body of missing American found in Turkey

STORY HIGHLIGHTS

• Body of New York woman found in Istanbul


• She disappeared almost two weeks ago


• Sarai Sierra was a mother a two


• She failed to arrive at Newark, New Jersey, airport

(CNN) -- The family of an American woman who went missing in Istanbul nearly two weeks ago is in mourning after learning that Turkish police found her body Saturday.

Steven Sierra wept during a phone call with CNN, as he waited in Istanbul to go with police to identify the body of his wife, Sarai Sierra.

Turkish police found the New York woman's body near ancient stone walls in Istanbul's Sarayburnu district, the semi-official Anatolian Agency reported. Police suspected she had been killed at another location.

Police told CNN's sister network CNN Turk that the body of the 33-year-old mother of two showed signs of stab wounds.

At least nine suspects had been detained in connection with Sierra's disappearance and death, Anatolian reported.

Sierra's family and friends first sounded the alarm last week after she did not arrive on a return flight from Istanbul on January 22.

"The last we heard from my wife was Monday morning on the 21st. She had spoken with her sister and the last thing she said was, 'I'm coming home tomorrow,' and she was excited and put a little smiley face at the end of her statement," said Steven Sierra in an interview with CNN earlier this week.

Steven Sierra spoke to CNN in Istanbul on Wednesday, after he and Sarai Sierra's brother, David Jimenez, traveled to Turkey to assist in the search.

The worried husband was periodically overwhelmed with emotion throughout the interview.

"You're hoping that she's OK wherever she's at, that she's not hurting, that she's not cold, that she's being fed," Steven Sierra said, choking back tears.

"Its difficult what's going through my mind, if our hopes and prayers are not answered. It is difficult when you have two children that look up to you, and you have to do your very best to stay strong regardless of what happens."

Sarai Sierra flew alone to Istanbul on January 7 after a friend at the last minute canceled plans to accompany her.

"She did a lot of researching about the area, about where she was going to stay, the safest places to go and the time of day to travel," friend Magalena Rodriguez said.

Sierrra was an amateur photographer who had amassed more than 3,000 followers since she joined the photo sharing app Instagram last year.

Some people she met through the service encouraged her to visit the ancient Turkish city, her husband said. They offered to act as tour guides. "You're admiring pictures, but you're getting acquainted with people that you've never met before," Steven Sierra said.

Sarai's brother said he had been worried about his sister's solo trip.

"We were nervous. Were just like 'always be mindful of what you do, be aware of your surroundings. Don't get too comfortable to the point where you drop your guard down,'" David Jimenez said.

But Jimenez and Sierra's husband said Sarai was determined to complete challenges that she set for herself.

As an example, they described how she competed in a triathlon several years ago, despite being a weak swimmer, and despite the fact that she did not own a bicycle. Instead, Sarai completed the cycling leg of the competition by borrowing a mountain bike from her husband.

After arriving in Istanbul, Sierra's photo feed displayed images of Istanbul's beautiful skyline and historic landmarks.

She also squeezed in an excursion to Amsterdam in the Netherlands and to Germany, starting January 15.

"She chose to go to Amsterdam for the graffiti," her husband said. "She informed me as far as how her time was out there. And she also had a tour guide that was helping her out there as well, who I know about and who I've spoken with personally."

Sierra returned to Istanbul on January 19. Three days later, she went missing.

Sierra had rebooked her flight to arrive back early, on January 22, in part to surprise her two sons, 9 and 11.

Days before her scheduled trip home, Sierra spoke with her father, Dennis Jimenez, via Skype to remind him of her flight number and arrival time.

When Dennis Jimenez went to the Newark, New Jersey, airport to pick Sierra up, she didn't show, he said.

The airline told him she had never checked in for the flight.

"She kept in contact with us all the time," Sierra's mother, Betzaida Jimenez, said. "And then not to hear from her? It's not like her."

After the tourist went missing, Turkish police released a surveillance camera video of Sarai at a shopping mall in Istanbul, flipping through her iPad.

The scenes from January 20 are the last known images of her.

The manager of the small private hotel where Sierra was staying reported last seeing her the day the surveillance video was shot. That was a Sunday.

Her Skype account, which she avidly used, went silent a day later. A day after that was when she missed her flight home.

The time she last talked with her family, Sierra was planning on January 21 to see the Galata Bridge and visit the Asian side of Istanbul, her husband said.

The former capital of the Byzantine and East Roman empires straddles the continents of Europe and Asia.

After Sierra's family raised the alarm that she was missing, some of her belongings -- including her passport and medical cards -- were found in her room in Istanbul, though her iPhone and iPad were not there, according to her husband.

Since Sierra's disappearance, Turkish police detained a Turkish man she had been in contact with who was identified only by the first name Talan, according to CNN Turk.

Millions of foreign tourists visit Turkey every year.

While it is not unusual to hear about foreigners being targeted by pickpockets and bag snatchers, violent crime involving foreign tourists is relatively rare.

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