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

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:

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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