The fight broke out at a cheesesteak stand after Monday afternoon's Winter Classic hockey game between the Rangers and Flyers.
Three men in Flyers jerseys jumped two men wearing Rangers gear.
One of the Rangers fans is a police officer from Woodbridge, New Jersey. The other was his son.
The father suffered a swollen eye and got several stitches.
You can watch the video here: http://www.youtube.com/watch?v=rq4PLa253WI&feature=youtu.be
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