OAKLAND (CBS SF) — A brawl between fans was caught on camera during Sunday’s Battle of the Bay game in Oakland.

The video posted to YouTube begins with a 49er fan being knocked to the ground and surrounded by Raider fans.  As the man got to his feet a verbal argument continued, and another Raider fan exchanged punches with the 49er fan before the brawl is broken up.

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Officers arrested the 49er fan before the video ends.  Security was boosted for the heated rivalry match, and at least twenty fans were arrested during Sunday’s event.

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The full video can be seen below (WARNING: GRAPHIC LANGUAGE)

In San Jose, a man who was shot outside a bar was fighting for his life after an apparent dispute between 49ers and Raiders fans.

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Brawls between 49ers and Raiders fans are nothing new.  The city of Oakland settled a federal civil rights lawsuit after a fans arm was broken by police during a melee between fans.