Philadelphia police are seeking the public's help with identifying a teenager who was caught on tape punching an elderly man in the face after an argument aboard a train.

The tape, released by transit police shows the two arguing for several minutes aboard a train Monday afternoon. At one point, a girl steps between them attempting to intervene.

Once on the platform the argument continues and ends with a crowd forming around the duo. The teen the punches the man, knocking him out with a single blow. The teen then fled the scene.

The victim suffered a concussion and a broken jaw.

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