Reports of explosion at Port Authority bus terminal

Police activity outside the Port Authority Bus Terminal following reports of an explosion in New York. Peter Foley, EPA-EFE

Police respond to a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

Police block off a sidewalk while responding to a report of an explosion in New York on Dec. 11, 2017. Mark Lennihan, AP

Police and other first responders respond to a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

Police activity outside the Port Authority Bus Terminal following reports of an explosion. Justin Lane, EPA-EFE

Police activity outside the Port Authority Bus Terminal following reports of an explosion inside an underground tunnel in the building in New York. Justin Lane, EPA-EFE

Port Authority Police watch as people evacuate after a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

Police and other first responders respond to a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

Police and other first responders respond to a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

Port Authority Police watch as people evacuate after a reported explosion at the Port Authority Bus Terminal on December 11, 2017 in New York. Bryan R. Smith, AFP/Getty Images

A crowd moves past police responding to a report of an explosion in New York. Mark Lennihan, AP

Fire trucks race towards the New York Port Authority after a reported explosion on Dec. 11, 2017 in New York. Ed Baig, USA TODAY

The scene on 8th avenue in New York as authorities secure the area near the Port Authority bus terminal in New York on Dec. 11, 2017. Matthew Diebel, USA TODAY

Emergency workers wait with a stretcher near the scene of a reported explosion in New York on Dec. 11, 2017. Matthew Diebel, USA TODAY

Authorities guard the area near a reported explosion in New York on Dec. 11, 2017. Matthew Diebel, USA TODAY