NEW YORK -- Two buses collided in the Lincoln Tunnel Friday morning, injuring 34 people, officials said, CBS New York reports. Seven of them were seriously injured.

The accident occurred mid-morning in the center tube of the tunnel, which runs under the Hudson River and connects midtown Manhattan and New Jersey. The Port Authority of New York and New Jersey, which manages the tunnel, said the collision involved two New Jersey Transit buses.

A New Jersey Transit official said the accident happened when a bus carrying 37 passengers rear-ended another bus with 25 passengers on board. He described it as a "fender bender" and said none of the injuries was life-threatening.

The Lincoln Tunnel is normally packed with commuter traffic, which was delayed as emergency crews responded to the crash. Officials said the tunnel is now open. The cause of the crash is under investigation.