Video: Surveillance camera captured explosion inside NYC subway tunnel near Port Authority

Surveillance video shows the moment a pipe bomb detonated during an attempted terror attack near Port Authority Bus Terminal.

MIDTOWN, Manhattan (WABC) -- Surveillance video shows the moments an explosive device detonated inside a subway tunnel near New York City's Port Authority Bus Terminal Monday morning.

The video, which was posted on social media, shows a crowd of people walking through the tunnel that runs under 42nd Street in Manhattan, connecting the Port Authority station with Times Square.

Moments into the video at 7:20 a.m., the explosion can be seen in the tunnel and then people start running.

NYPD officials confirmed the video was accurate.

Authorities said the suspected bomber had a pipe bomb affixed to him with Velcro straps. He was seriously injured. Four bystanders were treated for minor injuries.

Photos of the scene:

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

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.AP

Police block a street by Port Authority Bus Terminal near New York's Times Square following an explosion on Monday, Dec. 11, 2017.AP

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

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

Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City.WABC

This is Penn Station following a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City.WABC

Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City.WABC

More coverage of the NYC explosion:
* Mayor: Explosion at Port Authority Bus Terminal in Manhattan was attempted terror attack
* New York City terror attack: What we know about the suspect
* NYPD beefs up security in wake of Manhattan terror attack

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Video: Surveillance captured explosion inside NYC subway tunnel near Port Authority