BRIDGEPORT, Conn. — National Transportation Safety Board investigators are at the scene of the Connecticut train collision. The accident happened Friday during rush hour.

The collision happened when a train traveling from New Haven, Conn. to New York derailed. It then hit a train heading the other way.

Dozens were injured with at least 70 people needing medical attention.

"We'll be looking at the breaking performance of the train, the condition of the wheels, the condition of the car," said Earl Weener of NTSB. "We'll be looking at the general condition of the track and the rail bed. We'll be looking at signaling information."

Local officials say it could take weeks before train service is running again.

Three people are still in critical condition.