Video from inside the stadium shows a violent brawl that broke out between a group of home fans in the stands. The footage captured men and women trading blows.
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One of the men in the video shoved a woman down the bleachers while holding a beer. A security guard eventually arrived and broke up the fight.
It's not clear what prompted the violence or if anybody was arrested.
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Meanwhile, New York's offense never managed to get going against San Francisco's tenacious defense. The 49ers won 30-12.