New York City subway explosion: See photos of what happened at Manhattan bus terminal

Law enforcement officials work following an explosion near New York's Times Square on Monday, December 11, 2017, in New York. Police said a man with a pipe bomb strapped to him set off the crude device in an underground passageway under 42nd Street between Seventh and Eighth Avenues. The explosion triggered a massive emergency response by police and firefighters both above and below ground, tangling subway and bus service at the nearby Port Authority bus terminal. White House Press Secretary Sarah Sanders tweeted that President Donald Trump had been briefed on the explosion. (AP)

Police stand guard inside the Port Authority Bus Terminal following an explosion near Times Square on Monday, December 11, 2017, in New York. (AP Photo)

Police stand guard in front of Port Authority Bus Terminal following an explosion near Times Square on Monday. (AP)

Officials place suspect Akayed Ullah, on a stretcher, into the back of an ambulance on Eighth Avenue between 42nd Street and 43rd Street, Monday, December 11, 2017, in New York. (Craig Ruttle/Newsday via AP)

Ullah is suspected of strapping a pipe bomb to his body and setting off the crude device in a passageway under 42nd Street between Seventh and Eighth Avenues, injuring himself and a few others (AP Photo)

Akayed Ullah, a Bangladeshi man who attempted to detonate a homemade bomb strapped to his body at a New York commuter hub during morning rush hour is seen in this handout photo received December 11, 2017. (New York City Taxi and Limousine Commission/Handout via Reuters)

An armoured police truck occupies the street outside of the New York Port Authority in NYC after reports of an explosion. (Reuters)

Police officers stand guard outside the New York Port Authority Bus Terminal in NYC. (Reuters)

Emergency services are seen on the street following Manhattan explosion in New York, US, December 11 in this still image picture obtained from social media video. (Twitter/@Beingadnyc/Handout via Reuters)

Authorities said the bomb was a low-tech explosive device attached to the man with Velcro and plastic ties. They were investigating how it was made. (Reuters)

Emergency services are seen on the street following Manhattan explosion in NYC in this still image picture obtained from social media video. (Twitter/@Bulls_1177/Handout via Reuters)

An empty corridor is seen as police evacuates commuters from inside of the Port Authority bus station following explosion in NYC in this still image picture obtained from social media video. (Instagram/YAMI_SAMA890/Handout via Reuters)

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. (Reuters)

A police K-9 unit patrols outside the New York Port Authority Bus Terminal after the explosion. (Reuters)

New York State Governor Andrew Cuomo and New York City Mayor Bill de Blasio arrive for a news conference outside the New York Port Authority Bus Terminal. Reuters

Mayor Bill de Blasio and Police Commissioner James P. O’Neill labeled it an attempted terror attack. (Reuters)

A sign is seen on a window of a building nearby a home in the Brooklyn borough of New York City while Police investigate the explosion at the New York Port Authority Bus Terminal in Manhattan (Reuters)

Members of the media gather by the New York Port Authority bus terminal following the attempted detonation during the morning rush hour in New York City. (Reuters)