NEW YORK (CBS News/AP) - New York City police have identified the suspect in an explosion in a crowded subway corridor near the Port Authority bus terminal Monday morning as 27-year-old Akayed Ullah. Police say Ullah was carrying an "improvised low-tech explosive device" when it went off as he was in an underground pedestrian passageway at 42nd street between 7th and 8th Avenues, beneath the major commuter hub.
Mayor Bill de Blasio called it an "attempted terror attack."
Three people suffered minor injuries and the suspect was seriously injured. No other threats were apparent, the mayor said.
"Thank God the perpetrator did not achieve his ultimate goals," de Blasio said.
Ullah is in police custody. Officials say he sustained burns to his abdomen and hands after the crude pipe bomb exploded. A photo confirmed by CBS News showed a bearded man crumpled on the ground with his shirt apparently blown off and black soot covering his bare midriff. A police officer is holding the man's hands behind his back.
Surveillance cameras captured the man walking casually through the crowded passageway when the bomb suddenly went off at 7:20 a.m. amid a plume of white smoke, which cleared to show the man sprawled on the ground and commuters fleeing in terror.
Law enforcement officials told the Associated Press Ullah was inspired by the Islamic State of Iraq and Syria (ISIS), but apparently had no direct contact with the terrorist group. The officials spoke on condition of anonymity because they were not authorized to comment publicly about the suspect or incident.
They said he was speaking with investigators from his hospital bed.
New York City Police Commissioner James O'Neill said the suspect "made statements" when he was taken into custody but wouldn't say whether he made reference to ISIS.
The device was based on a pipe bomb and affixed to the suspect's body with a combination of velcro and zip ties, said John Miller, the deputy commissioner of intelligence & counter-terrorism for the NYPD. A federal law enforcement official told CBS News' Jeff Pegues the device malfunctioned. The source says "it did not fully detonate which possibly caused the injury."
O'Neill said it wasn't clear whether the suspect detonated the device by accident or whether the location was intentional. Police and the Joint Terrorism Task Force were investigating how the device was made and where he got the bomb-making instructions, reports CBS New York.
The suspect also had another device on him, sources tell CBS News.
New York Governor Andrew Cuomo says the suspect may have crafted the device from online instructions, and so far it doesn't appear to be part of a larger plot.
Cuomo told cable news channel NY1 that officials "have reason to believe that this person went to the internet and found out how to make a homemade bomb."
Authorities are investigating the incident as a possible "lone wolf" attack based on the rudimentary construction of the device, reports CBS New York.
The suspect is from Bangladesh, CBS News has learned. 48 Hours' Murray Weiss reports he has an address in Brooklyn. O'Neill wouldn't confirm whether the suspect has a local address but said it's part of the NYPD's investigation. Ullah entered the U.S. with his parents and three to four siblings in February 2011 on an immigrant visa, sources tell CBS News. He obtained a green card and became a permanent U.S. resident.
"DHS can confirm that the suspect was admitted to the United States after presenting a passport displaying an F43 family immigrant visa in 2011," said Department of Homeland Security acting Press Secretary Tyler Houlton in an email to CBS News. "The suspect is a lawful permanent resident from Bangladesh who benefited from extended family chain migration."
Just over a year after arriving in the U.S., in March 2012, Ullah secured a livery license, the New York City Taxi & Limousine Commission tells CBS News' Graham Kates. That license, which was not for a New York City cab, but instead for a so-called "for-hire" vehicle, lapsed in March 2015.
Police spoke with Ullah's family in the Flatlands section of Brooklyn, CBS New York's Marcia Kramer reported. Investigators were searching his apartment, interviewing witnesses and relatives and looking for surveillance footage that may show his movements in the moments before the attack.
Ullah apparently traveled overseas to Bangladesh in September and returned in October, a law enforcement source tells CBS News senior investigative producer Pat Milton. He also previously traveled to the United Arab Emirates, Milton reports.
Ullah had no criminal history prior to Monday's attack, Weiss reports.