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Police in Central Russia have detained eight people suspected of leading an attack on a rock festival. They say the brawl could have started after a local cafe owner argued with a member of the audience. Up to a hundred young men started beating up the crowd with clubs at the 'Tornado' festival in the Chelyabinsk region. Some eyewitnesses said they even heard gunshots. More than ten people have been injured, two remain in hospital. Earlier reports suggested the mob were members of a nationalist gang, but regional authorities have since denied those claims. Some three thousand people were at the festival during the attack.