A photo published by the New York Post showed a bearded man crumpled on the ground with his shirt apparently blown off and black soot covering his bare midriff.
Sean Monroe was cleaning the underground subway corridor between Times Square and the Port Authority Bus Terminal when the pipe bomb went off on Monday morning.
It was not immediately clear who would represent Ullah in court.
New York Police Commissioner James O'Neill said at the same news conference that the attacker had the bomb strapped to his body when it detonated, and suffered minor burns.
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.
Also, the president said that "the United States must fix its lax immigration system, which allows many risky, inadequately vetted people to access our country".
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Attorney General Jeff Sessions also weighed in, saying "the 20-year-old son of the sister of a USA citizen should not get priority to come to this country ahead of someone who is high-skilled, well-educated, has learned English, and is likely to assimilate and flourish here".
Akayed, who hails from Chittagong, has lived in the USA for seven years. In the last few years, Butrico said, he had some unpleasant encounters with Ullah. "His family used to block the driveway all the time".
- Neighbors told Butrico they had heard fighting and yelling at Ullah's home during the past two nights.
Police rushed to secure the scene and evacuate pedestrians. Officers and federal agents also appeared at another Brooklyn address associated with Ullah.
When questioned, Ullah allegedly told investigators he was motivated by deaths of Muslims around the world, according to a senior official with knowledge of the investigation.
"In bomb making... it's not as easy as these instructions make it out to be, which is a good thing", Miller said.
Gov. Cuomo said at a news briefing the situation could have been much worse, adding, "This is NY, the reality is we are a target by many".
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The Masjid Nur Al Islam mosque in Kensington, which Ullah was said to have attended, was closed Monday.
At the Brooklyn home where officials say Ullah lived with relatives, neighbors said the young man had worked as a cabdriver, and seemed quiet. Ullah, Mohammad said, was close to the mosque's imam and was often seen with him at afternoon prayers.
He said Ullah visited Bangladesh in September, and spent a month with his wife.
Ullah, a licensed city taxi driver from March 2012 through March 2015, is believed to have been the only person involved and is in custody. The officials were unable to say if Ullah had driven a yellow cab or for a private service like Lyft or Uber. "They said 'suspicious package'".
Police officials in Bangladesh said Monday that they had never heard of Ullah, and the country's embassy in Washington issued a statement declaring a "zero tolerance" policy toward terrorism.
"A terrorist is a terrorist irrespective of his or her ethnicity or religion, and must be brought to justice", the government said in a statement.
Condemnations of the bombing did little to lessen the confusion in Ullah's neighborhood.
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Marlyn Yu Sherlock was at a retail store on the main floor of the terminal when people began flooding out of the subway entrance, "screaming, running in panic", she said. "You don't know who your neighbors are".