San Francisco 49ers' preseason game against the Denver Broncos took an ugly turn in the stands Saturday.
Video shows several fans at Levi's Stadium throwing punches as the brawl turned bloody.
It's unclear how the fight started, but fans dressed in Niners jerseys were involved in the chaotic brawl.
Read more: https://www.ktvu.com/news/huge-fight-during-49ers-game-turns-bloody
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