Sunday, Fortaleza won its league's championship on Sunday, and in celebration the fans stormed the field. Things quickly turned from a celebration into brawls and rioting as they clashed with fans of the other team and began destroying things on the field.
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As you can see in the video above, they were breaking chairs and tearing down the advertisement boards around the field and hurling them at other people. It was a wild scene and they didn't have enough of a police presence to contain the fans, so they had to start using tear gas and flash grenades to disperse the crowd.
