Philadelphia police on Saturday released a video of a man they say stabbed another during a fight on a SEPTA bus in Frankford, and are seeking the public's help in finding the assailant.

It was shortly before 2 p.m. Friday when the suspect got on a Route 56 bus, which was traveling south on Torresdale Avenue.

The man was unable to pay his fare and was asked to leave the bus at the next stop, police said.

When the man refused to leave, another man, who was a passenger on the bus, began to argue with him, police said.

In the video, after the bus stopped on Torresdale Avenue, near Paul Street, and the door opened, the alleged fare evader is seen milling about in the front of the bus when all of a sudden, the other male passenger pushes him out of the bus.

The fare evader then jumps back on the bus, and the two men tussle with each other. Their fight continued as they got off the bus.

Police said the fare evader stabbed the other man in the head, neck and abdomen, then fled the area.

The victim was taken by medics to Temple University Hospital, where he was in stable, but critical condition, police said.

The suspect is described as a dark-complexioned black man, about 5-foot-7, and about 30 years old. He was wearing a dark-colored jacket and a dark-colored hat with fur.

The video can be viewed at:

Anyone who has information about this case is asked to call the Northeast Detective Division at 215-686-3153 or -3154.