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On the day of the UEFA Cup Final, violence erupted between football hooligan supporters of both teams and the Greater Manchester Police, resulting in 39 arrests and 39 injured officers.

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Football hooliganism, also known as football rioting, constitutes violence and other destructive behaviors perpetrated by spectators at association football events. Football hooliganism typically involves conflict between pseudo-tribes, formed to intimidate and attack supporters…Source: Wikipedia (CC BY-SA)
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