During this morning's commute, a train pulling into the King and Fourth Street Caltrain station collided with the end of track stopper. The accident hurled many passengers to the floor. Multiple injuries have been reported.

Caltrain passenger William Diaz sent out the following Twitter updates:

@WillieFDiazSF "...the tracks and brakes were wet and they locked and slipped on track."

@WillieFDiazSF "Caltrain hit track stop at King Station twitpic.com/45dlmi "

@WillieFDiazSF "...Multiple injuries..."

@WillieFDiazSF "...reports now of people missing teeth."

We'll update as soon as we know more. Video of one passenger being whisked away by EMT below.