A person briefed on the investigation said Ullah came to the USA on an F-4 visa, a preferential visa available for those with family in the US who are citizens or permanent residents, and that he made the bomb in his Brooklyn apartment. He did not elaborate.
Law enforcement officials said Ullah was inspired by the Islamic State group, but had apparently not had any direct contact with the terror group.
The government said in a statement that "Bangladesh is committed to its declared policy of "zero tolerance" against terrorism, and condemns terrorism and violent extremism in all forms or manifestations anywhere in the world, including Monday morning's incident in New York City".
White House press secretary Sarah Huckabee Sanders tweeted that President Donald Trump had been briefed on the explosion. The others who were injured suffered ringing in the ears and headaches.
A loud explosion rocked the busy pedestrian passageway connecting the Port Authority Bus Terminal with New York City's IND and IRT subway lines around 7:20 a.m. Monday.
Ullah had strapped the crudely fashioned device to his body with a combination of Velcro and zip ties, police said.
Ullah had married a Bangladeshi woman about two years ago, and she lived in Dhaka, the cousin said, adding that Ullah had a normal education in Bangladesh before moving to the United States.
He is believed to have acted alone.
New York City police department officers and other first responders work the scene near the Port Authority Bus Terminal on Monday
A member of the Federal Bureau of Investigation enters the crime scene beneath the New York Port Authority Bus Terminal following an attempted detonation during the morning rush hour, in New York City, New York, U.S., December 11, 2017. Ullah told police he assembled it in Brooklyn, the source said.
According to census statistics compiled by Queens College, Kensington is home to more than 3,000 Bangladeshi-born New Yorkers, making it the largest Bangladeshi enclave in Brooklyn.
The source said the explosion, if it had detonated properly, "could have inflicted a lot more harm".
Collins was working his usual beat of looking for kids being trafficked at the Port Authority Bus Terminal on 42nd Street when the incident occurred.
Ullah was taken to NYC Health and Hospitals/Bellevue with burns to his abdomen and hands, the FDNY said.
Avoid the area. Subways bypassing #PortAuthority and Times Square Stations. Citizens have been able to apply for spouses, parents, children, siblings and the siblings' spouses and minor children; the would-be immigrants are then screened by US officials to determine whether they can come. Federal charges are expected to be filed Tuesday, as well.
Mannan said Ullah appeared to have no criminal record in Bangladesh and was not a known member of any militant group.
At the hospital, Ullah was interviewed by investigators.
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