Bangladesh officials are trying to track down family and associates of Akayed Ullah, a Bangladeshi man who US authorities say set off a homemade pipe bomb in a crowded New York City commuter hub.
New York bombing suspect, Akayed Ullah, 27, was taken to a hospital after suffering burns from the explosive device, which was attached to his body with Velcro and zip ties and did not fully ignite, officials said.
Investigators told Reuters they believe the attack in midtown Manhattan was intended to be a suicide bombing. Officials called it an attempted terrorist attack.
Ullah is a US resident and has no criminal record in his home city of Chittagong. He last visited Bangladesh on September 8.
"Police are looking for (Ullah's) family but so far they've not been able to trace them," Abul Khair Nadim, the Chair of Musapur Union council - a local government body in the Chittagong division in southern Bangladesh where Ullah's family originally lived, said.
A probe into his background has revealed little apart from the fact Ullah did not have a criminal record and was not on a watchlist of extremist suspects.
"So far, his name is not on our wide-range list of radicalised persons or members of terror groups, both from Bangladesh and outside," senior counter terrorism police officer Sanwar Hossain told AFP.
"We are trying to gather more details."
Ullah arrived in the United States seven years ago as the member of a family already living there under what is known as "chain immigration".
Bangladesh police said Ullah's family hailed from Sandwip, an island off the coast of the southern port city of Chittagong, but his father had migrated to the capital Dhaka some 30 years ago.
Three people injured
The blast, which occurred about 7am local time in a busy underground passageway between the subway station underneath the Port Authority Bus Terminal and the Times Square subway station, sent commuters fleeing for the exits and police officers rushing to the scene, as authorities scrambled to reroute trains and shut down streets.
Three people, including a police officer, suffered minor injuries.
The attack came just six weeks after police say an Uzbek man, Sayfullo Saipov, ploughed a truck through a crowd of pedestrians along a bike path in lower Manhattan, killing eight in an act for which Islamic State later claimed responsibility.
In September 2016, a man injured 31 people when he set off a homemade bomb in New York's Chelsea neighbourhood.
In recent years, numerous people claiming to be inspired by Islamic State have carried out attacks across Europe, the Middle East and the United States.
A law enforcement official familiar with the Ullah investigation said investigators have found evidence that he watched Islamic State propaganda on the internet.
The weapon used in Monday's attack was "amateur-level," New York Governor Andrew Cuomo said at a news conference near the explosion site. He told CNN the homemade bomb may not have fully ignited, possibly limiting the damage.
Officials said the attempted bombing underscored New York City's status as a target for such attacks, citing the attacks of September 11, 2001, which killed more than 2,750 people in New York and nearly 3,000 people in all, and the 1993 World Trade Center bombing, which killed six people.
"Let's be clear, as New Yorkers, our lives revolve around the subways," Mayor Bill de Blasio said at a news conference.
"And let's also be clear, this was an attempted terrorist attack."
In a statement, President Donald Trump said the attack emphasised the need for US immigration reforms.
"America must fix its lax immigration system, which allows far too many dangerous, inadequately vetted people to access our country," he said.
The president also criticised the visa program that allowed Ullah to enter the United States in 2011 because he had family members already in the country, saying such family visas are "incompatible with national security."
Ullah lived with his mother, sister and two brothers in Brooklyn and was a green card holder, said Shameem Ahsan, consul general of Bangladesh in New York.
Authorities did not immediately comment on Ullah's motives.
When asked whether Ullah had claimed any connection to Islamic State, New York Police Commissioner James O'Neill said: "He did make statements but we're not going to talk about that right now."
Several US officials familiar with the investigation told Reuters there was no immediate information indicating Ullah was previously known to any American spy or law enforcement agency for any connection to militants or terrorism.
Ullah had a black cab/limousine driver's license from 2012 to 2015, the New York Taxi and Limousine Commission said.
Monday's incident was captured on security video, police said. Video posted on NYPost.com showed smoke and a man lying in a long tunnel that connects sections of the sprawling Times Square subway station. A photograph showed a man lying face down, with tattered clothes and burns on his torso.
City's busiest station
"There was a stampede up the stairs to get out," said one commuter, Diego Fernandez. "Everybody was scared and running and shouting."
The bus terminal was temporarily closed, and a large swath of midtown Manhattan was closed to traffic. Subway travel was disrupted but later returned to normal.
In December, New York experiences a surge of visitors who come to see elaborate store window displays, the Rockefeller Center Christmas tree and Broadway shows.
More than 200,000 people use the Times Square station, the city's busiest, each weekday, according to the Metropolitan Transportation Authority. Ten train lines stop at the station.
The bus terminal is the busiest in the United States, according to the Port Authority. On a typical weekday, about 220,000 passengers arrive or depart on more than 7,000 buses.
The bus terminal is adjacent to and above the subway station's western section. A long, narrow underground tunnel connects that part of the station to its eastern section, and is used by thousands of commuters during rush hour.
The incident rippled through American financial markets, briefly weakening stock markets as they were starting trading for the week and giving a modest lift to safe-haven assets such as US Treasuries.
Technology and energy stocks closed higher on Monday, helping Wall Street shake off uncertainties following the explosion.
- with AFP