Major Incidents | Slideshow

NYC Bomb

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NYC Subway Explosion

Police respond to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Charles Zoeller)

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NYC Subway Explosion

A crowd moves past police responding to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Mark Lennihan)

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NYC Subway Explosion

Police block off a sidewalk while responding to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Mark Lennihan)

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NYC Subway Explosion

People walk past Port Authority Bus Terminal as police respond to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Mark Lennihan)

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NYC Subway Explosion

A police officer stands guard in front of Port Authority Bus Terminal as law enforcement respond to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Police stand guard in front of the Port Authority Bus Terminal near New York’s Times Square following an explosion on Monday, Dec. 11, 2017. Police say the explosion happened in an underground passageway under 42nd Street between 7th and 8th Avenues. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Police block a street by Port Authority Bus Terminal near New York’s Times Square following an explosion on Monday, Dec. 11, 2017. Police say the explosion happened in an underground passageway under 42nd Street between Seventh and Eighth Avenues. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Police secure Eighth Avenue outside the Port Authority Bus Terminal following an explosion near New York's Times Square on Monday, Dec. 11, 2017. 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. (AP Photo/Chuck Zoeller)

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NYC Subway Explosion

New York Gov. Andrew Cuomo speaks to members of the media after a pipe bomb strapped to a man went off in a New York City subway near Times Square on Monday, Dec. 11, 2017, in New York. Mayor Bill de Blasio stands fourth from left. (AP Photo/Mark Lennihan)

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NYC Subway Explosion

Law enforcement officials work following an explosion near New York's Times Square on Monday, Dec. 11, 2017. 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. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Law enforcement officials work following an explosion near New York's Times Square on Monday, Dec. 11, 2017. Police said a man with a pipe bomb strapped to his body set off the crude device in a passageway under 42nd Street between Seventh and Eighth Avenues. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Law enforcement officials work following an explosion near New York's Times Square on Monday, Dec. 11, 2017. 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. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Police stand guard in front of Port Authority Bus Terminal following an explosion near New York's Times Square on Monday, Dec. 11, 2017. 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. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

Police stand guard inside the Port Authority Bus Terminal following an explosion near Times Square on Monday, Dec. 11, 2017, in New York. Police said a man with a pipe bomb strapped to his body set off the crude device in a passageway under 42nd Street between Seventh and Eighth Avenues. (AP Photo/Andres Kudacki)

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NYC Subway Explosion

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