New Theory on How Homing Pigeons Find Home

Jane J. Lee

Homing pigeons (Columba livia) have been prized for their navigational abilities for thousands of years. They've served as messengers during war, as a means of long-distance communication, and as prized athletes in international races.

But there are places around the world that seem to confuse these birds—areas where they repeatedly vanish in the wrong direction or scatter on random headings rather than fly straight home, said Jon Hagstrum, a geophysicist who authored a study that may help researchers understand how homing pigeons navigate.

Hagstrum's paper, published online Wednesday in the Journal of Experimental Biology, proposes an intriguing theory for homing pigeon disorientation—that the birds are following ultralow frequency sounds back towards their lofts and that disruptions in their ability to "hear" home is what screws them up.

Called infrasound, these sound waves propagate at frequencies well below the range audible to people, but pigeons can pick them up, said Hagstrum, who works at the U.S. Geological Survey in Menlo Park, California.

"They're using sound to image the terrain [surrounding] their loft," he said. "It's like us visually recognizing our house using our eyes."

Homeward Bound?

For years, scientists have struggled to explain carrier pigeons' directional challenges in certain areas, known as release-site biases.

This "map" issue, or a pigeon's ability to tell where it is in relation to where it wants to go, is different from the bird's compass system, which tells it which direction it's headed in. (Learn about how other animals navigate.)

"We know a lot about pigeon compass systems, but what has been controversial, even to this day, has been their map [system]," said Cordula Mora, an animal behavior researcher at Bowling Green State University in Ohio who was not involved in the study.

Until now, the two main theories say that pigeons rely either on their sense of smell to find their way home or that they follow the Earth's magnetic field lines, she said.

If something screwed up their sense of smell or their ability to follow those fields, the thinking has been, that could explain why pigeons got lost in certain areas.

But neither explanation made sense to Hagstrum, a geologist who grew interested in pigeons after attending an undergraduate lecture by Cornell biologist William Keeton. Keeton, who studied homing pigeons' navigation abilities, described some release-site biases in his pigeons and Hagstrum was hooked.

"I was just stunned and amazed and fascinated," said Hagstrum. "I understand we don't get dark matter or quantum mechanics, but bird [navigation]?"

So Hagstrum decided to look at Keeton's pigeon release data from three sites in upstate New York. At Castor Hill and Jersey Hill, the birds would repeatedly fly in the wrong direction or head off randomly when trying to return to their loft at Cornell University, even though they had no problems at other locations. At a third site near the town of Weedsport, young pigeons would head off in a different direction from older birds.

There were also certain days when the Cornell pigeons could find their way back home from these areas without any problems.

At the same time, homing pigeons from other lofts released at Castor Hill, Jersey Hill, and near Weedsport, would fly home just fine.

Sound Shadows

Hagstrum knew that homing pigeons could hear sounds as low as 0.05 hertz, low enough to pick up infrasounds that were down around 0.1 or 0.2 hertz. So he decided to map out what these low-frequency sound waves would have looked like on an average day, and on the days when the pigeons could home correctly from Jersey Hill.

He found that due to atmospheric conditions and local terrain, Jersey Hill normally sits in a sound shadow in relation to the Cornell loft. Little to none of the infrasounds from the area around the loft reached Jersey Hill except on one day when changing wind patterns and temperature inversions permitted.

That happened to match a day when the Cornell pigeons had no problem returning home.

"I could see how the topography was affecting the sound and how the weather was affecting the sound [transmission]," Hagstrum said. "It started to explain all these mysteries."

The terrain between the loft and Jersey Hill, combined with normal atmospheric conditions, bounced infrasounds up and over these areas.

Some infrasound would still reach Castor Hill, but due to nearby hills and valleys, the sound waves approached from the west and southwest, even though the Cornell loft is situated south-southwest of Castor Hill.

Records show that younger, inexperienced pigeons released at Castor Hill would sometimes fly west while older birds headed southwest, presumably following infrasounds from their loft.

Hagstrum's model found that infrasound normally arrived at the Weedsport site from the south. But one day of abnormal weather conditions, combined with a local river valley, resulted in infrasound that arrived at Weedsport from the Cornell loft from the southeast.

Multiple Maps

"What [Hagstrum] has found for those areas are a possible explanation for the [pigeon] behavior at these sites," said Bowling Green State's Mora. But she cautions against extrapolating these results to all homing pigeons.

Some of Mora's work supports the theory that homing pigeons use magnetic field lines to find their way home.

What homing pigeons are using as their map probably depends on where they're raised, she said. "In some places it may be infrasound, and in other places [a sense of smell] may be the way to go."

Hagstrum's next steps are to figure out how large an area the pigeons are listening to. He's also talking to the Navy and Air Force, who are interested in his work. "Right now we use GPS to navigate," he said. But if those satellites were compromised, "we'd be out of luck." Pigeons navigate from point to point without any problems, he said.

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Union says Congress can save money by lowering amount paid for contractor salaries

As policymakers prepare for the across-the-board budget cuts known as sequestration, the largest federal employee union is taking the opportunity to press a pet peeve — large payments to federal contractors.

Labor leaders, including those with the American Federation of Government Employees (AFGE), have long pushed Congress to lower payments for contractor salaries. The cap on Defense Department contractor pay now stands at $763,000, which is much more than President Obama makes.

AFGE said billions of dollars could be saved each year if the cap were set at $200,000, as the Obama administration has proposed. A cap would not prevent contractors from paying their employees more, but it would limit the amount the government provides for contractor salaries.

“Think about it,” said AFGE President J. David Cox. Billions of dollars could be cut “from federal spending over the next decade with no impact on government services, simply by subsidizing these almost unimaginably wealthy contractor employees at a slightly less generous level.”

Stan Soloway, president of the Professional Services Council, which represents contractors, said the cap was put in place for two reasons: to “ensure companies can attract top executive talent but also ensure the government is not subsidizing egregious executive salaries.”

Lowering the cap, he added, could “deny both the contractor and the government access to the talent it needs.”

The Obama administration also has pushed Congress to lower the amount paid to contractors. A year ago, a blog post from Leslie Field, acting administrator of the Office of Management and Budget’s office of federal procurement policy, said Obama wants “Congress to scrap an outdated law that requires taxpayers to foot the bill for excessive payments to CEOs and other senior executives of companies that contract with the Government.”

Because of that law, Field said taxpayers “have their hard-earned resources spent reimbursing contractor executives far in excess of what can be justified.”

In December, Congress considered, but did not approve a proposal to lower the cap. Instead, Congress told the Government Accountability Office to study the effect of reducing contractor compensation.

“Congress has had no problem freezing wages for one group of federal workers, yet many lawmakers have turned a blind eye to the outrageous salaries earned by another group,” Cox said. “Both workforces are paid for by American taxpayers. What’s the difference?”

Poll: Workers’ opinions

With the federal government going through an extended period of shrinking budgets, government managers will have to become better stewards of the workforce.

That’s the message from a Merit Systems Protection Board (MSPB) report issued Tuesday.

The report is based on a survey of more than 42,000 federal workers. Although done in 2010, the survey has lessons that are relevant today as supervisors increasingly try to figure out how to get the job done with fewer resources.

Having few resources, namely staffers, is the reason the report was issued so long after the survey was done, according to MSBP.

“If agencies find they can no longer ‘do more with less,’ they may need to make hard decisions about what they can do with the resources they have,” says the report on “Managing Public Employees in the Public Interest.”

Dealing with workers who are not getting the job done can be a difficult task for managers. Federal managers are not very good at that, according to the surveyed employees. The managers also don’t fare well, in the eyes of employees, when it comes to making hard decisions about using their diminished resources.

Less than a quarter of federal employees said their agencies deal with poor performers effectively. Only 29 percent said their organizations eliminate unnecessary functions and positions.

On the positive side, agencies rate better, although not great, on standards of conduct, training and guarding the public interest. Sixty-four percent of employees said their agencies hold employees to high standards of conduct. Sixty percent said they get the necessary training and their agencies put the public interest first.

“Employees are being asked to make personal and professional sacrifices and they need to feel confident that leaders are using limited resources wisely,” MSPB Chairwoman Susan Tsui Grundmann said in a news release. “That requires agency leaders to make tough choices about the programs, functions or positions that they can support.”

Previous columns by Joe Davidson are available at wapo.st/JoeDavidson.

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S'pore moves up to 2nd spot in trust survey

SINGAPORE: Singapore has moved up to the number two spot for the most trusting nation in the world, according to the 2013 Edelman Trust Barometer. It was third in 2012 and seventh in 2011.

Edelman, which measured levels of trust in institutions in 26 countries worldwide, said on Wednesday that Singapore's total trust score rose by nine points and is three points more than the global average increase.

Trust levels rose across three of the four institutions measured -- business (up 11 points), non-governmental organisations (up 11 points) and government (up 9 points).

At 82 per cent, trust in Singapore government recovered to approach the 2010 high of 84 per cent.

Trust levels in the media remained stable and high.

Edelman said while the government and business fared well in the latest trust survey, there remains scepticism about trust in their leadership.

Only 19 per cent of Singaporeans in the general population trust business leaders to tell the truth, no matter how complex or unpopular it is. While trust in government leaders is higher than in business leaders, there remains room for improvement.

Edelman said the lack of trust in leaders, compared with the institutions they lead, is a trend in all the markets where trust was measured. This, it said, points to a common need to increase transparency at the leadership level.

-CNA/ac

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Govt will be prompt in pursuing Verma panel recommendations on rape laws: PM

NEW DELHI: Prime Minister Manmohan Singh on Wednesday said that the government will be prompt in pursuing the recommendations of J S Verma Committee to amend the law to deal effectively with cases of sexual assault against women.

In a letter to Justice Verma, former Chief Justice of India, Manmohan Singh thanked him and other two members of the committee--Justice (retd) Leila Seth and former Solicitor General Gopal Subramanian--for completing within a short period of 30 days the work of the panel, set up in the wake of the brutal gang rape and assault of a 23-year-old here on December 16 2012.

"That the committee submitted its report within a short period of 30 days is testimony to your commitment and concern for the public good...

"On behalf of our government, I assure you that we will be prompt in pursuing the recommendations of the committee," the Prime Minister said in the letter.

Singh also thanked the committee members for their "labour of love" in pursuing their job to recommend amendments to the law to deal effectively with cases of sexual assault of extreme nature against women.

The Verma Committee has recommended enhancing punishment to up to 20 years imprisonment for rape and murder and life term for gang rape but refrained from suggesting death penalty for the guilty.

In its 630-page report submitted to the government on January 23, the Committee suggested various amendments to the criminal laws to provide for higher punishment to rapists, including those belonging to police and public servants.

New offences have been created and stiffer punishment has been suggested for those committing such offence that left the victim in a vegetative state. The new offences include disrobing a woman, voyeurism, stalking and trafficking.

The present statute provides for punishment of imprisonment ranging from seven years to life for rapists. The panel was constituted in the wake of national outrage over the gang rape in a moving bus in south Delhi. The victim died in a Singapore hospital on December 29.

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Timbuktu’s vulnerable manuscripts are city’s "gold"

French and Malian troops surrounded Timbuktu on Monday and began combing the labyrinthine city for Islamist fighters. Witnesses, however, said the Islamists, who claim an affiliation to al Qaeda and had imposed a Taliban-style rule in the northern Malian city over the last ten months, slipped into the desert a few days earlier.

But before fleeing, the militants reportedly set fire to several buildings and many rare manuscripts. There are conflicting reports as to how many manuscripts were actually destroyed. (Video: Roots of the Mali Crisis.)

On Monday, Sky News posted an interview with a man identifying himself as an employee of the Ahmed Baba Institute, a government-run repository for rare books and manuscripts, the oldest of which date back to the city's founding in the 12th century. The man said some 3,000 of the institute's 20,000 manuscripts had been destroyed or looted by the Islamists.

Video showed what appeared to be a large pile of charred manuscripts and the special boxes made to preserve them in front of one of the institute's buildings.

However, a member of the University of Cape Town Timbuktu Manuscript Project told eNews Channel Africa on Tuesday that he had spoken with the director of the Ahmed Baba Institute, Mahmoud Zouber, who said that nearly all of its manuscripts had been removed from the buildings and taken to secure locations months earlier. (Read "The Telltale Scribes of Timbuktu" in National Geographic magazine.)

A Written Legacy

The written word is deeply rooted in Timbuktu's rich history. The city emerged as a wealthy center of trade, Islam, and learning during the 13th century, attracting a number of Sufi religious scholars. They in turn took on students, forming schools affiliated with's Timbuktu's three main mosques.

The scholars imported parchment and vellum manuscripts via the caravan system that connected northern Africa with the Mediterranean and Arabia. Wealthy families had the documents copied and illuminated by local scribes, building extensive libraries containing works of religion, art, mathematics, medicine, astronomy, history, geography, and culture.

"The manuscripts are the city's real gold," said Mohammed Aghali, a tour guide from Timbuktu. "The manuscripts, our mosques, and our history—these are our treasures. Without them, what is Timbuktu?"

This isn't the first time that an occupying army has threatened Timbuktu's cultural heritage. The Moroccan army invaded the city in 1591 to take control of the gold trade. In the process of securing the city, they killed or deported most of Timbuktu's scholars, including the city's most famous teacher, Ahmed Baba al Massufi, who was held in exile in Marrakesh for many years and forced to teach in a pasha's court. He finally returned to Timbuktu in 1611, and it is for him that the Ahmed Baba Institute was named.

Hiding the Texts

In addition to the Ahmed Baba Institute, Timbuktu is home to more than 60 private libraries, some with collections containing several thousand manuscripts and others with only a precious handful. (Read about the fall of Timbuktu.)

Sidi Ahmed, a reporter based in Timbuktu who recently fled to the Malian capital Bamako, said Monday that nearly all the libraries, including the world-renowned Mamma Haidara and the Fondo Kati libraries, had secreted their collections before the Islamist forces had taken the city.

"The people here have long memories," he said. "They are used to hiding their manuscripts. They go into the desert and bury them until it is safe."

Though it appears most of the manuscripts are safe, the Islamists' occupation took a heavy toll on Timbuktu.

Women were flogged for not covering their hair or wearing bright colors. Girls were forbidden from attending school, and boys were recruited into the fighters' ranks.

Music was banned. Local imams who dared speak out against the occupiers were barred from speaking in their mosques. In a move reminiscent of the Taliban's destruction of Afghanistan's famous Bamiyan Buddha sculptures, Islamist fighters bulldozed 14 ancient mud-brick mausoleums and cemeteries that held the remains of revered Sufi saints.

A spokesman for the Islamists said it was "un-Islamic" for locals to "worship idols."

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Bipartisan group of senators to unveil framework for immigration overhaul

A key group of senators from both parties will unveil on Monday the framework of a broad overhaul of the nation’s immigration laws, including a pathway to citizenship for more than 11 million illegal immigrants.

The detailed, four-page statement of principles will carry the signatures of four Republicans and four Democrats, a bipartisan push that would have been unimaginable just months ago on one of the country’s most emotionally divisive issues.

The document is intended to provide guideposts that would allow legislation to be drafted by the end of March, including a potentially controversial “tough but fair” route to citizenship for those now living in the country illegally.

[Do you think the new immigration plan will work? Discuss this and other immigration issues in The Washington Post’s new political forums.]

It would allow undocumented immigrants with otherwise clean criminal records to quickly achieve probationary legal residency after paying a fine and back taxes.

But they could pursue full citizenship — giving them the right to vote and access to government benefits — only after new measures are in place to prevent a future influx of illegal immigrants.

Those would include additional border security, a new program to help employers verify the legal status of their employees and more-stringent checks to prevent immigrants from overstaying visas.

And those undocumented immigrants seeking citizenship would be required to go to the end of the waiting list to get a green card that would allow permanent residency and eventual citizenship, behind those who had already legally applied at the time of the law’s enactment.

The goal is to balance a fervent desire by advocates and many Democrats to allow illegal immigrants to emerge from society’s shadows without fear of deportation with a concern held by many Republicans that doing so would only encourage more illegal immigration.

“We will ensure that this is a successful permanent reform to our immigration system that will not need to be revisited,” the group asserts in its statement of principles.

The framework identifies two groups as deserving of special consideration for a separate and potentially speedier pathway to full citizenship: young people who were brought to the country illegally as minors and agricultural workers whose labor, often at subsistence wages, has long been critical to the nation’s food supply.

Expanding visas

The plan also addresses the need to expand available visas for high-tech workers and promises to make green cards available for those who pursue graduate education in certain fields in the United States.

“We must reduce backlogs in the family and employment visa categories so that future immigrants view our future legal immigration system as the exclusive means for entry into the United States,” the group will declare.

The new proposal marks the most substantive bipartisan step Congress has taken toward new immigration laws since a comprehensive reform bill failed on the floor of the Senate in 2007.

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Infrastructure development to keep pace with population growth

SINGAPORE: The government is planning to build 700,000 new homes by 2030.

That is one of the long-term plans to support the projected increase in population which is expected to hit 6.9 million in about 20 years.

Some Singaporeans have observed that population growth in Singapore has outpaced infrastructure development in the last five years.

The government is now planning and investing in advance to accommodate a larger population.

Beyond just relieving strains on public transport and housing today are long-terms plans to ramp up infrastructure developments to support a population of up to six million in 2020 and then a population of up to 6.9 million in 2030.

There are already plans to add 800 buses over five years, and by 2030, to double of the rail network to 360 kilometres.

This means the addition of three new MRT lines and an extension of two existing lines over the next nine years.

Come 2030, there will be another two new lines and three extensions, allowing eight in 10 homes to be within a 10-minute walk from a train station.

To further alleviate the strain on public transport, more jobs will be located near residential areas, reducing the need to commute.

The White Paper has named Woodlands, Serangoon and Punggol as possible growth areas to create more space for businesses. It also said the Jurong Lake District, Paya Lebar Central and One-North will be expected to mature by then.

More healthcare facilities are also in the pipeline with three general hospitals, five community hospitals and two medical centres set to open between 2014 and 2020.

On the way too are 200,000 new homes which will be ready by 2016.

National Development Minister Khaw Boon Wan said even more land has been set aside to build another 500,000 homes until 2030.

Mr Khaw said: "I am very confident that we will be able to resolve this housing shortage very soon because once you say let's build a town, it takes more years. That's why I begin to publicise what are the number of housing units that will be coming on stream in 2014 and 2015. They are very big numbers and that is to assure Singaporeans that there are enough homes for you. Don't panic, don't need to worry.

"Practically for first timers or new family formations, the problem is actually largely resolved. There is some mismatch purely because of our balloting system. If you look at the figure, every year, (there is around 15,000) new family formations involving Singaporeans but I'm building 25,000 new units a year and we've been doing so. This is into the third year now. There are many more new units being formed than the number of new family formations.

"And effectively, what is happening is we are now meeting future demand because the fiance scheme is for couples who are not yet married. They are being rational. They are planning ahead so that hopefully when the key is received, they can also exchange rings, so that they time it properly, which is a good thing, which is something that we support."

Possible sites for these new homes include new towns in Bidadari, Tampines North and Tengah but some will also be built in mature estates, allowing children to stay close to their parents.

Mr Khaw said: "Wherever possible, where there are possible sites for development, we have to do so. And that is why sometimes, it is a bit painful for us to have to remove some trees, which I know many people are upset about. We are equally upset because I love trees. I'm a treehugger and we think many times before to chop down a tree or not to chop down a tree. But sometimes it can't be helped because of larger objectives, larger benefits."

Mr Khaw added that good urban planning to achieve a high quality of living is a top priority for the government.

He said: "Unlike other cities, they have hinterlands to go to. Thanks to former Prime Minister Lee Kuan Yew, he was already ahead of his time. When we talk about the terms you hear today - green, garden city, sustainable living, etc., he was really ahead of his time because he knew that this was the only way for us to survive because this is the only place we have. This is the only city, this is our home, and if it is polluted, dirty, crowded, congested, then what kind of a life will we get?"

There will be more green spaces and parks, and by 2030, at least 85 per cent of Singapore's households will live within 400 metres of a park.

The National Development Ministry is expected to release more details on land use plans this week.

- CNA/fa

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Chhattisgarh land acquisition, large-scale tree felling for NH four-laning sparks row

PITHORA: Massive land acquisition and indiscriminate tree felling for four-laning of National Highway-53 (NH-53) has sparked unrest among the locals, who are now up in arms against the state government.

More than 55,000 trees are being cut on the stretch of 115 Kms from Aarang to Saraipali, not only affecting those in possession of the land and trees but also the environment as a whole. "Large number of farmers is losing their lands for compensation less than the market value or even the actual value of the land. Chopping down trees in large numbers, despite the state facing a lot of pollution related problems due to industrialisation, is going to be serious concern in the coming years," locals told TOI.

Though the affected farmers and people would get compensation from National Highway Authority of India (NHAI) but their grievances are now taking a shape of protest with even more complaints. A group of farmers and others have formed a committee and submitted a memorandum to State Governor Shekhar Dutt, Chief Minister Raman Singh. They are also contemplating to take up the issue with Prime Minister.

"NHAI and the State Environment Conservation Board are supposed to issue the EIA (Environment Impact Assessment) report to all the related departments including Public Works Department, Municipal Corporation, District, block and tehsil officers and also the Sarpanch of all the blocks. Being a Sarpanch, I have not yet received any copy of the assessment report while as part of the process, a copy of EIA is supposed to be produced to the Sarpanch," said Vinod Sinha, sarpanch, Pithora.

As per the norms, EIA reports are supposed to be issued to the sarpanch before organizing the public hearing for ascertaining concerns of local and affected people, but they alleged that the hearing was done in a hush-hush manner in the month of September, 2012 without issuing EIA and without taking the locals into confidence.

Meanwhile forest officials in Pithora said the farmers and affected people were being compensated depending upon the size of the trees and land. However, they refused to divulge the details of the compensation being given for land and trees.

Farmers, however, told TOI that though the officials claim that centre's guidelines are being followed, the scenario shows that the farmers are being paid even less than the actual value of the land as fixed by the Mahasamund district administration for the purpose of registration of land deeds.

"My land of 1.5 acres, which is an irrigated agricultural land with grown up trees, has been put on stake due to NH -53. As per the Mahasamund registry rate 2012, each acre of my land costs not less than Rs 6.3 lakh, which would provide me not less than Rs 10 lakh if considered the market value. But the amount calculated by the government comes down to a paltry Rs 5 lakh! This mere amount won't let me buy even a small piece of land according to the market value," HD Ghosh, a farmer in Pithora said.

More than 600 farmers are being affected with four-laning work of NH-53. "The rate of the land located on the right and left side of the road differs with thousands of rupees, per square metre. The farmers are not even aware of the rate, which the government has fixed for their lands," the agitating locals alleged adding that the NHA directly issuing the cheques to the farmers without having any consultation. The rate of the land has increased to 30 per cent in a year but the farmers are not even getting the actual value of the land being evacuated by the government.

Talking to TOI, Gautam Bandhopadhyay, convenor National Highway Affected Farmers and Citizens Committee, said, "Central and state government has been violating the rules of EIA Act and NHAI Act due to which thousands of farmers and citizens have been displaced without allotment of compensation and settlement. Implementation of proper rehabilitation policy is needed for the affected people."

Despite repeated efforts, Mahasamund district collector R Shangeetha could not be reached for comments.

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Space Pictures This Week: Martian Gas, Cloud Trails

Image courtesy SDO/NASA

The sun is more than meets the eye, and researchers should know. They've equipped telescopes on Earth and in space with instruments that view the sun in at least ten different wavelengths of light, some of which are represented in this collage compiled by NASA and released January 22. (See more pictures of the sun.)

By viewing the different wavelengths of light given off by the sun, researchers can monitor its surface and atmosphere, picking up on activity that can create space weather.

If directed towards Earth, that weather can disrupt satellite communications and electronics—and result in spectacular auroras. (Read an article on solar storms in National Geographic magazine.)

The surface of the sun contains material at about 10,000°F (5,700°C), which gives off yellow-green light. Atoms at 11 million°F (6.3 million°C) gives off ultraviolet light, which scientists use to observe solar flares in the sun's corona. There are even instruments that image wavelengths of light highlighting the sun's magnetic field lines.

—Jane J. Lee

Published January 28, 2013

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US Mom Missing in Turkey Took Side Trips

Sarai Sierra, the New York mother who disappeared in Turkey while on a solo trip, took several side excursions out of the country, but stayed in contact with her family the entire time, a family friend told ABC News.

Turkish media reported today that police were trying to establish why Sierra visited Amsterdam and Munich. Police were also trying to establish the identity of a man Sierra, 33, was chatting with on the Internet, according to local media.

Rachel Norman, a family friend, said the man was a group tour guide from the Netherlands and said Sierra stayed in regular touch with her family in New York.

Steven Sierra, Sarai's husband, and David Jimenez, her brother, arrived in Istanbul today to aid in the search.

The men have been in contact with officials from the U.S. consulate in the country and plan to meet with them as soon as they open on Tuesday, Norman said.

After that, she said Sierra and Jimenez would meet with Turkish officials to discuss plans and search efforts.

Family of Sarai Sierra|AP Photo

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Sarai Sierra was supposed to fly back to the United States on Jan. 22, but she never showed up for her flight home.

Her two boys, ages 11 and 9, have not been told their mother is missing.

Sierra, an avid photographer, left New York on Jan. 7. It was her first overseas trip, and she decided to go ahead after a friend had to cancel, her family said.

"It was her first time outside of the United States, and every day while she was there she pretty much kept in contact with us, letting us know what she was up to, where she was going, whether it be through texting or whether it be through video chat, she was touching base with us," Steven Sierra told ABC News before he departed for Istanbul.

But when it came time to pick her up from Newark Liberty International Airport in New Jersey, Sierra wasn't on board her scheduled flight.

Steven Sierra called United Airlines and was told his wife had never boarded the flight home.

Further investigation revealed she had left her passport, clothes, phone chargers and medical cards in her room at a hostel in Beyoglu, Turkey, he said.

The family is suspicious and said it is completely out of character for the happily married mother, who met her husband in church youth group, to disappear.

The U.S. Embassy in Turkey and the Turkish National Police are involved in the investigation, WABC-TV reported.

"They've been keeping us posted, from my understanding they've been looking into hospitals and sending out word to police stations over there," Steven Sierra said. "Maybe she's, you know, locked up, so they are doing what they can."

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