Chemical key to cell division revealed

In each of our cells, most of the genetic material is packaged safely within the nucleus, which is protected by a double membrane. The biochemistry behind how this membrane transforms when cells divide has finally been unravelled, offering insights that could provide new ways of fighting cancer and some rare genetic disorders.

During cell division, the membrane that surrounds the nucleus breaks down and reforms in the two daughter cells. Researchers have been split on the precise mechanisms that govern membrane reformation. One view is that proteins alone control the membrane's transformations. Another possibility is that changes in lipids – a vast group of fat-related compounds – are responsible.

Experiments had failed to show which of these two ideas was right, because it was difficult to alter lipid levels in specific compartments of cells without affecting other cellular processes.

Banafshe Larijani at Cancer Research UK's London Research Institute and her colleagues have now overcome that hurdle. They came up with a technique that transforms a type of lipid called a diacylglycerol (DAG) into another lipid, within the nuclear membrane.

Chemical cascade

The technique involves inserting two fragments of DNA into the nucleus of a cell. This causes the cell to make two proteins: the first attaches itself to the nuclear membrane, the second floats around the cell. Adding a drug – rapalogue – to the mix causes the second protein to stick to the first, which in turn causes a chemical cascade that transforms the DAG into a different kind of lipid.

Crucially, they targeted a form of DAG that does not bind to proteins, so converting it into a different lipid does not affect any processes involving proteins in the cell.

The team tested the effect of this lipid manipulation on cell division in monkey and human cancer cells. The lower the level of DAG present in the nuclear membrane, the greater the membrane malformation and chance of cell death.

This demonstrates that lipids play a role in nuclear membrane reformation that does not depend on proteins.

Larijani says it "opens the door to finding ways to kill cancerous cells" by focusing on lipids that are important to the nuclear membrane's development.

Sausage pieces

As the nucleus divides, sausage-shaped fragments of its membrane float around the cell. The fragments have curved ends, and Larijani says that changes in lipid composition generate these curves, without which the fragments cannot reassemble correctly into new membranes.

More than a dozen rare genetic conditions such as Hutchinson-Gilford progeria syndrome, which is characterised by premature ageing in children, have been linked to irregularities in cell division. A better understanding of the way the nuclear membrane forms when cells divide could be key to treating these disorders.

The research also offers a new focus for preventing the irregular cell division that underlies many cancers.

"As a result of this work we now know with confidence that DAG plays a structural role in membrane dynamics," says Vytas Bankaitis, at the Texas A&M Health Science Center in College Station, who was not involved in the study. "If we could find a molecule with suitable characteristics, this manipulation could be done [in humans], which is something that has not really been considered before."

Journal reference: PLoS ONE DOI: 10.1371/journal.pone.0051150

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Beijing to allow visa-free transit trips

BEIJING: China will allow transit passengers from 45 countries including the US, Canada and all members of the EU to spend up to 72 hours in Beijing without a visa from next month, city authorities said.

The move would "strongly spur the development of the tourism industry, speed up building of an international city (and) expand contacts with the rest of the world," the Beijing Tourism Administration said on its website.

The policy only applies to travellers in transit to a third country, and not for return flights to the capital, whose attractions include the vast Forbidden City.

Eligible nationalities include the United States, Canada, European Union countries, Brazil, Argentina, Australia, South Korea, Japan and the United Arab Emirates.

The city will "starting on January 1, 2013, implement a policy allowing foreigners from 45 countries with visas and plane tickets to a third country to transit through Beijing for 72 hours without a visa", the tourism body said.

But travellers would "face punishment" if they left the capital and lawbreakers would be banned for life, Gao Huada, deputy director of the city's exit-entry bureau, was quoted in the China Daily as saying on Thursday.

China's financial hub Shanghai already allows some foreigners in transit to visit the city for 48 hours, its government says on its website, including those from the US, some European countries, Japan, South Korea and Singapore.

Other travellers passing through the country are required to remain in the airport.

Beijing's airport is the second busiest in the world, having handled 47 million passengers in the first seven months of this year, according to the industry body Airports Council International.

Shanghai airport ranks 20th busiest with 26 million travellers during the same period.

- AFP/ck

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Plaintiff in $2.7B judgment against Yahoo willing to take less

After winning a $2.7 billion preliminary judgment against Yahoo, a plaintiff in the Mexico City civil court case said the matter can be settled for less than the court's judgment.

The judgment handed down Friday by the 49th Civil Court of the Federal District of Mexico City involved allegations that Yahoo was in breach of contract related to a yellow-pages listing service. The lawsuit was brought by Worldwide Directories S.A. de C.V. and Ideas Interactivas, S.A. de C.V.

However, a partner in both firms tells Reuters that he and his partners would be willing to entertain a settlement offer of less than the $2.7 billion judgment.

"If we can reach a settlement with an interesting number, we would go for it," Carlos Bazan-Canabal told Reuters, adding that there were less than people involved in the case against Yahoo.

The dispute involves a business venture formed by the companies between 2002 and 2004 for an online business search. The deal was supposed to last until 2009, but Yahoo canceled the deal, causing Ideas Interactivas to go bankrupt, Bazan-Canabal said.

CNET has contacted Yahoo for comment and will update this report when we learn more. Yahoo had previously said the claims were without merit and that it planned to vigorously pursue all appeals.

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A 2020 Rover Return to Mars?

NASA is so delighted with Curiosity's Mars mission that the agency wants to do it all again in 2020, with the possibility of identifying and storing some rocks for a future sample return to Earth.

The formal announcement, made at the American Geophysical Union's annual fall meeting, represents a triumph for the NASA Mars program, which had fallen on hard times due to steep budget cuts. But NASA associate administrator for science John Grunsfeld said that the agency has the funds to build and operate a second Curiosity-style rover, largely because it has a lot of spare parts and an engineering and science team that knows how to develop a follow-on expedition.

"The new science rover builds off the tremendous success from Curiosity and will have new instruments," Grunsfeld said. Curiosity II is projected to cost $1.5 billion—compared with the $2.5 billion price tag for the rover now on Mars—and will require congressional approval.

While the 2020 rover will have the same one-ton chassis as Curiosity—and could use the same sky crane technology involved in the "seven minutes of terror"—it will have different instruments and, many hope, the capacity to cache a Mars rock for later pickup and delivery to researchers on Earth. Curiosity and the other Mars rovers, satellites, and probes have garnered substantial knowledge about the Red Planet in recent decades, but planetary scientists say no Mars-based investigations can be nearly as instructive as studying a sample in person here on Earth.

(Video: Mars Rover's "Seven Minutes of Terror.")

Return to Sender

That's why "sample return" has topped several comprehensive reviews of what NASA should focus on for the next decade regarding Mars.

"There is absolutely no doubt that this rover has the capability to collect and cache a suite of magnificent samples," said astronomer Steven Squyres, with Cornell University in New York, who led a "decadal survey" of what scientists want to see happen in the field of planetary science in the years ahead. "We have a proven system now for landing a substantial payload on Mars, and that's what we need to enable sample return."

The decision about whether the second rover will be able to collect and "cache" a sample will be up to a "science definition team" that will meet in the years ahead to weigh the pros and cons of focusing the rover's activity on that task.  

As currently imagined, bringing a rock sample back to Earth would require three missions: one to select, pick up, and store the sample; a second to pick it up and fly it into a Mars orbit; and a third to take it from Mars back to Earth.

"A sample return would rely on all the Mars missions before it," said Scott Hubbard, formerly NASA's "Mars Czar," who is now at Stanford University. "Finding the right rocks from the right areas, and then being able to get there, involves science and technology we've learned over the decades."

Renewed Interest

Clearly, Curiosity's success has changed the thinking about Mars exploration, said Hubbard. He was a vocal critic of the Obama Administration's decision earlier this year to cut back on the Mars program as part of agency belt-tightening but now is "delighted" by this renewed initiative.

(Explore an interactive time line of Mars exploration in National Geographic magazine.)

More than 50 million people watched NASA coverage of Curiosity's landing and cheered the rover's success, Hubbard said. If things had turned out differently with Curiosity, "we'd be having a very different conversation about the Mars program now."

(See "Curiosity Landing on Mars Greeted With Whoops and Tears of Jubilation.")

If Congress gives the green light, the 2020 rover would be the only $1 billion-plus "flagship" mission—NASA's largest and most expensive class of projects—in the agency's planetary division in the next decade. There are many other less ambitious projects to other planets, asteroids, moons, and comets in the works, but none are flagships. That has left some planetary scientists not involved with Mars unhappy with NASA's heavy Martian focus.

Future Plans

While the announcement of the 2020 rover mission set the Mars community abuzz, NASA also outlined a series of smaller missions that will precede it. The MAVEN spacecraft, set to launch next year, will study the Martian atmosphere in unprecedented detail; a lander planned for 2018 will study the Red Planet's crust and interior; and NASA will renew its promise to participate in a European life-detection mission in 2018. NASA had signed an agreement in 2009 to partner with the European Space Agency on that mission but had to back out earlier this year because of budget constraints.

NASA said that a request for proposals would go out soon, soliciting ideas about science instruments that might be on the rover. And as for a sample return system, at this stage all that's required is the ability to identify good samples, collect them, and then store them inside the rover.

"They can wait there on Mars for some time as we figure out how to pick them up," Squyres said. "After all, they're rocks."

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McAfee Arrested for Entering Guatemala Illegally

Eccentric software tycoon John McAfee, wanted in Belize for questioning in the shooting death of his neighbor, has been arrested in Guatemala for entering the country illegally, his Guatemala attorney told ABC News.

Before McAfee's arrest, he told ABC News in an exclusive interview he would be seeking asylum in Guatemala. McAfee was arrested by the Central American country's immigration police and not the national police, said his attorney, who was confident his client would be released within hours.

"Thank God I am in a place where there is some sanity," said McAfee, 67, before his arrest. "I chose Guatemala carefully."

McAfee said that in Guatemala, the locals aren't surprised when he says the Belizean government is out to kill him.

"Instead of going, 'You're crazy,' they go, 'Yeah, of course they are,'" he said. "It's like, finally, I understand people who understand the system here."

But McAfee added he has not ruled out moving back to the United States, where he made his fortune as the inventor of anti-virus software, and that despite losing much of his fortune he still has more money than he could ever spend.

In his interview with ABC News, a jittery, animated but candid McAfee called the media's representation of him a "nightmare that is about to explode," and said he's prepared to prove his sanity.

McAfee has been on the run from police in Belize since the Nov. 10 murder of his neighbor, fellow American expatriate Greg Faull.

During his three-week journey, said McAfee, he disguised himself as handicapped, dyed his hair seven times and hid in many different places during his three-week journey.

He dismissed accounts of erratic behavior and reports that he had been using the synthetic drug bath salts. He said he had never used the drug, and said statements that he had were part of an elaborate prank.

Johan Ordonez/AFP/Getty Images

John McAfee Interview: Software Mogul Leaves Belize Watch Video

John McAfee Interview: Software Millionaire on the Run Watch Video

John McAfee: Software Millionaire Not Officially a Suspect Watch Video

Investigators said that McAfee was not a suspect in the death of the former developer, who was found shot in the head in his house on the resort island of San Pedro, but that they wanted to question him.

McAfee told ABC News that the poisoning death of his dogs and the murder just hours later of Faull, who had complained about his dogs, was a coincidence.

McAfee has been hiding from police ever since Faull's death -- but Telesforo Guerra, McAfee's lawyer in Guatemala, said the tactic was born out of necessity, not guilt.

"You don't have to believe what the police say," Guerra told ABC News. "Even though they say he is not a suspect they were trying to capture him."

Guerra, who is a former attorney general of Guatemala, said it would take two to three weeks to secure asylum for his client.

According to McAfee, Guerra is also the uncle of McAfee's 20-year-old girlfriend, Samantha. McAfee said the government raided his beachfront home and threatened Samantha's family.

"Fifteen armed soldiers come in and personally kidnap my housekeeper, threaten Sam's father with torture and haul away half a million dollars of my s***," claimed McAfee. "If they're not after me, then why all these raids? There've been eight raids!"

Before his arrest, McAfee said he would hold a press conference on Thursday in Guatemala City to announce his asylum bid. He has offered to answer questions from Belizean law enforcement over the phone, and denied any involvement in Faull's death.

False Report of McAfee Arrest on Mexico Border

Over the weekend, a post on McAfee's blog claimed that he had been detained on the Belizean/Mexico border.

On Monday, a follow-up post said that the "John McAfee" taken into custody was actually a "double" who was carrying a North Korean passport with McAfee's name.

That post claimed that McAfee had already escaped Belize and was on the run with Samantha and two reporters from Vice Magazine.

McAfee did not reveal his location in that post, and a spokesman for Belize's National Security Ministry, Raphael Martinez, told ABC News on Monday that no one by McAfee's name was ever detained at the border and that Belizean security officials believed McAfee was still in their country.

However, a photo posted by Vice magazine on Monday with their article, "We Are With John McAfee Right Now, Suckers," apparently had been taken on an iPhone 4S and had location information embedded in it that revealed the exact coordinates where the photo was taken -- in the Rio Dulce National Park in Guatemala -- as reported by Wired.com.

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When is a baby too premature to save?

It was never easy, but trying to decide whether to save extremely premature babies just got harder.

A study called EPICure compared the fates of babies born 22 to 26 weeks into pregnancy in the UK in 1995 with similar babies born in 2006. In this 11-year period, the babies surviving their first week rose from 40 to 53 per cent. But an accompanying study comparing the fate of survivors at age 3 found that the proportion developing severe disabilities was unchanged, at just under 1 in 5.

"We've increased survival, but it's confined to the first week of life," says Kate Costeloe of Queen Mary, University of London, author of the first study. "Yet the pattern of death and health problems is strikingly similar between the two periods."

The absolute numbers of premature babies born over the 11 year period increased by 44 per cent, from 666 in 1995 to 959 in 2006. This meant that the absolute numbers of children with severe disabilities such as blindness, deafness or lameness also rose, increasing the burden on health, educational and social services.

Lifelong disability

"As the number of children that survive preterm birth continues to rise, so will the number who experience disability throughout their lives," says Neil Marlow of University College London, who led the second study.

By far the worst outcomes were for the youngest babies, with 45 per cent of those born at 22 or 23 weeks in 2006 developing disabilities compared with 20 per cent of those born at 26 weeks. In 1995 only two babies survived after being born at 22 weeks. In 2006, three did.

In 2006, a panel of UK ethicists concluded that babies born at 22 weeks should be allowed to die, as with babies born at or before 23 weeks in France and Holland.

Journal references: BMJ, Costeloe et al, DOI: 10.1136/bmj.e7976; Marlow et al, DOI: 10.1136/bmj.e7961

If you would like to reuse any content from New Scientist, either in print or online, please contact the syndication department first for permission. New Scientist does not own rights to photos, but there are a variety of licensing options available for use of articles and graphics we own the copyright to.

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PSYprise for 'Gangnam Style' fans

SINGAPORE: Tired of 'Gangnam Style'? Certainly not the more than 4000 people who turned up to catch PSY at the free Marina Bay Sands "Give back to Singapore" concert over the weekend.

As for those who can't get enough of the South Korean sensation and weren't fast enough to be among the lucky few to dance with the 'Gangnam Style' star, the good news is that it will take more than just fast fingers and a good internet connection to see PSY live in Singapore again.

Capping his one-night, under one-hour show in Singapore, the sensation from South Korea who repeatedly said he loved the Lion City, announced to whoops and cheers that he'd be back once his new single and album is released in March next year.

By then, more fans will hopefully get to see and hear more of PSY than what was offered at Saturday's open-air event at Marina Bay Sand's Event Plaza.

The gates for the free concert opened two hours ahead of the 8pm show that saw the main star showing up almost half an hour later.

The restless crowd was kept entertained and psyched to PSY's YouTube hit by 26 dancers from O School, a Singapore social enterprise that helps fund the education of teens from low income homes through its dance school.

On stage, the team of young dancers, including 10-year-old Calvin Go, added their own flavour to the now famous 'Gangnam Style' dance routine that was learnt in an hour on the concert day itself, according to Kenny Low, Managing Director of O School.

But there's nothing like the real thing.

When Psy finally took centre-stage, the crowd went wild with shouts of "oppa!", a Korean term of endearment used by females to refer to an older male friend or older brother, and also a key word in the Korean hit song.

And that was as close to 'Gangnam Style' anyone got at the start of the concert as the atypical K pop sensation launched into "Champion".

The single from his third album '3 Psy' released in 2002, seemed a fitting start to the concert organised by MBS that also showcased its adopted charity, O School, that helps keep teens from dropping out of school.

PSY, a college dropout who is now a champion in his own right, later told the crowd laughingly, "I was a really bad student... I got suspended so many times" as he "officially introduced" himself.

"Academically, I was (a) bad student, but creatively, I was (a) good student" was the piece of inPSYration delivered by the 34-year-old who swept four awards at the recent 2012 MNet Asian Music Awards (MAMA) with 'Gangnam Style' after years of being sidelined.

Despite a whirlwind tour of the region before landing in Singapore just hours before his concert, the hyperactive PSY continued to surprise during his appearance.

Even with concert-goers and non-ticket on-lookers standing around the Event Plaza loudly cheering, it wasn't enough for PSY, who suddenly stopped his second song to urge the crowd on.

"Show me energy and I'll show you energy! I want every single person to jump!" he yelled midway into "Right Now", the single from his fifth album "PSYFIVE" released in 2010.

But it seemed that the crowd was saving its energy for one song and of course, the man himself knew what it was.

"This song is called… No, no no, just give me the beat," Psy declared unable to hide the grin on his face as he dived into his third and final song for the night.

That's when the crowd really began to scream, almost drowning out the now-familiar electro-bass beats pounding out of the speakers around the Event Plaza.

Not a word was missed or a move forgotten as the crowd went PSYchotic, shouting the Korean lyrics of 'Gangnam Style' while trying to horse-dance in what limited space they could afford in the sea of sardine-packed bodies.

Adults, teens and even grey-haired elders were seen moving to the infectious tune.

In a flash, the one-hour concert was over.

PSY had been on stage less than three quarters of that time, but fans didn't seem to mind.

"It was a good experience although it was very short" said Yu Ping, a 15-year-old student who got her ticket from a family friend.

"Maybe he's just very busy" said the understanding fan.

Marina Bay Sands which had said that the free concert would happen come rain or shine, was likely glad that Singapore's rainy spell held off for the night and the stars remained in alignment for PSY's one-night appearance.

"We had a slot on our calendar, he had a slot on his calendar" said Mr. George Tanasijevich, President and Chief Executive Officer of MBS of just how the most well-known and in-demand person in the world was clinched for the public event.

"I think it came together pretty quickly", Tanasijevich shared with channelnewsasia.com on the sidelines of the concert.

"Maybe it's a little less strategic than you think it is... It's more opportunistic," he added with a laugh.

It was however, definitely good strategy that allowed MBS' designated charity, O School, to raise its public profile through the event.

"The talents of O School are incredible dancers who demonstrated professionalism and excellent showmanship during the showcase" said Tanasijevich.

And what better reward for the young dancers than being the opening act for PSY? Well, probably the man himself ... with the dancers treated to an exclusive backstage Meet and Greet Session after the concert while the crowds lingered, hoping to spy PSY.

-CNA/fl

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Redbox Instant's full launch won't be until spring 2013

It looks like the rumor mill was a little off this time -- Verizon's Redbox Instant won't be launching this month, as was previously speculated but rather in 2013. However, its public beta should be good to go within the next few weeks.

Verizon chairman and CEO Lowell McAdam announced today at an investor conference that after public beta testing the commercial launch of the video streaming and DVD rental service should kick off either at the end of 2013's first quarter or the beginning of the second quarter, according to The Hollywood Reporter.

"We are in the process of internal employee beta testing right now and we are very pleased with the progress," McAdam said at the conference. "I think later this month into the first part of January, we will open it up to customers but in a beta sort of format so that we can shake out any kinks that are left in the process."

Redbox Instant is a joint venture that was announced in February between Verizon and Coinstar -- the company that owns the Redbox DVD rental business. The companies have worked on developing an on-demand video streaming service with DVD rentals, much like what Netflix offers. They had originally expected to introduce the new service in the second half of 2012.

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Scientific Results From Challenger Deep

Jane J. Lee

The spotlight is shining once again on the deepest ecosystems in the ocean—Challenger Deep in the Mariana Trench (map) and the New Britain Trench near Papua New Guinea. At a presentation today at the American Geophysical Union's conference in San Francisco, attendees got a glimpse into these mysterious ecosystems nearly 7 miles (11 kilometers) down, the former visited by filmmaker James Cameron during a historic dive earlier this year.

Microbiologist Douglas Bartlett with the University of California, San Diego described crustaceans called amphipods—oceanic cousins to pill bugs—that were collected from the New Britain Trench and grow to enormous sizes five miles (eight kilometers) down. Normally less than an inch (one to two centimeters) long in other deep-sea areas, the amphipods collected on the expedition measured 7 inches (17 centimeters). (Related: "Deep-Sea, Shrimp-like Creatures Survive by Eating Wood.")

Bartlett also noted that sea cucumbers, some of which may be new species, dominated many of the areas the team sampled in the New Britain Trench. The expedition visited this area before the dive to Challenger Deep.

Marine geologist Patricia Fryer with the University of Hawaii described some of the deepest seeps yet discovered. These seeps, where water heated by chemical reactions in the rocks percolates up through the seafloor and into the ocean, could offer hints of how life originated on Earth.

And astrobiologist Kevin Hand with the Jet Propulsion Laboratory in Pasadena, California, spoke about how life in these stygian ecosystems, powered by chemical reactions, could parallel the evolution of life on other planets.

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Subway Push Murder Suspect Implicated Self: Police

A suspect believed to be responsible for throwing a man into the path of an oncoming New York City subway train who was taken into custody today has made statements implicating himself, police said.

According to Deputy Commissioner for Public Information Paul Browne, the suspect has been questioned by police since at least early afternoon and while the suspect is in police custody, he has not been officially charged.

Police are continuing to question the suspect and more lineups have been scheduled for tomorrow, Browne said.

Police have not released the suspect's name but began questioning him Tuesday afternoon about the death of Ki-Suck Han, 58, of Queens, N.Y.

Han was tossed onto the subway track at 49th Street and Seventh Avenue around 12:30 p.m. Monday after Han confronted a mumbling man who was alarming other passengers on the train platform. Han tried to scramble back onto the platform, but was crushed by an oncoming train.

The suspect fled the station, prompting a police dragnet for a man described by witnesses and see on surveillance video as a 6-foot-tall, 200-pound black man wearing dreadlocks in his hair.

Witnesses tried to revive the victim after he was hit and provided descriptions of the suspect to police.

Dr. Laura Kaplan, medical resident at Beth Israel Medical Center who was standing on the platform during the incident rushed to give Han aid after he was hit, she said in a statement released by her medical practice today.

New York Police Department

Bystanders Pull Mom, Son From Subway Tracks Watch Video

"A security guard and I performed 3-4 minutes of chest compressions. I hope the family may find some comfort in knowing about the kindness of these good Samaritans, as they endure this terrible loss," Kaplan said.

"I would like the family to know that many people in the station tried to help Mr. Han by alerting the subway personnel," she said.

Kaplan said she wanted to console the family of Han, who she called "a brave man trying to protect other passengers that he did not know."

The suspect had reportedly been mumbling to himself and disturbing other passengers, according to ABC News affiliate WABC. Police told WABC that the suspect could be mentally disturbed.

The suspect could be heard arguing with Han just moments before he hurled Han onto the track bed, according to surveillance video released by the police. The suspect is heard telling the victim to stand in line and "wait for the R train."

A freelance photographer for the New York Post was on the platform and said he ran towards the train flashing his camera hoping to alert the train to stop in time, but the train caught Han against the shoulder deep platform wall.

The photographer, R. Umar Abbasi, caught an eerie photo of Han with his head and arms above the platform and staring at the oncoming train.

Han was treated by EMS workers on the platform for traumatic arrest and rushed to Roosevelt Hospital, where he was pronounced dead, according to the Fire Department of New York.

"I just heard people yelling. The train came to an abrupt stop about three-quarters into the station and that's when I heard a man was hit by a train," Patrick Gomez told ABC News affiliate WABC.

Police set up a command post outside the train station Monday night searching nearby surveillance cameras to try and get a clear image of the suspect, reports WABC. They said Tuesday that the investigation is ongoing.

Anyone with information is asked to call Crime Stoppers at 1-800-577-TIPS (8477). The public can also submit tips by logging onto the Crime Stoppers website at www.nypdcrimestoppers.com or by texting their tips to 274637 (CRIMES) then enter TIP577. All calls are strictly confidential.

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