A man wearing a homemade pipe bomb set off the explosive in a busy transit hub on Monday, injuring five and setting off panic during the morning commute.
Authorities said the explosion in a walkway below Port Authority Bus Terminal was an isolated attempted terrorist attack. Officials said the suspect, 27-year-old Akayed Ullah, pledged allegiance to ISIS and said he acted in response to Israeli actions in Gaza.
Investigators said the suspect had at least two devices, a law enforcement source with knowledge of the investigation told CNN. The device that detonated was a foot-long pipe that contained black powder, a battery, wiring, nails and screws. It was attached to Ullah with Velcro and zip ties. Investigators did not elaborate on the second device, the source said.
The explosive chemical ignited in the pipe but the pipe itself did not explode, lessening its impact, New York Gov. Andrew Cuomo told CNN's Wolf Blitzer.
"Fortunately for us, the bomb partially detonated," he said. "He did detonate it, but it did not fully have the effect that he was hoping for."
Akayed Ullah was taken into custody Monday.
Ullah's movements: The suspect was first spotted on a security camera as he began to climb the subway station stairs to the 18th Avenue F. train platform in Brooklyn at 6:25 a.m. about an hour before the attack, according to one law enforcement official with direct knowledge of the investigation.
He then switched to the A train at Jay St./Metro Tech stop in Brooklyn before exiting the train at the Port Authority Bus Terminal stop in Manhattan, the same law enforcement official says.
How bomb was made: The suspect made the bomb last week at his apartment in Brooklyn, according to one law enforcement official with direct knowledge of the investigation.
Suspect's condition: Ullah is at Bellevue Hospital, where he is being treated for lacerations and burns to his hands and abdomen, New York City Fire Department Commissioner Daniel Nigro said. Five people were treated for minor injuries in area hospitals.
His prior credentials: Ullah held a Taxi & Limousine Commission license from March 2012 to March 2015, after which the license was not renewed, TLC spokesman Allan Fromberg said. It's unclear "whether he drove for any particular base, or whether he simply got the license but didn't drive at all," Fromberg said.
Residency: He is of Bangladeshi descent and lives in Brooklyn, two law enforcement sources told CNN. Ullah came to the United States in 2011 on an F43 family immigrant visa, said Department of Homeland Security spokesman Tyler Houlton. He is a lawful permanent resident.
What his neighbor says: Alan Butrico owns a Brooklyn building next to the home where he says Ullah lives with his family. He said Ullah lives in the basement, while his sister and brother live above him. "He wasn't friendly at all. The family was very quiet themselves. They don't talk to nobody. They just stay there," he said, adding that his tenants reported hearing "screaming and yelling" coming from Ullah's home the last two nights. The tenants did not call police, he said.
Akayed Ullah fell to the ground after the incident.
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