article: Surrey Police said bottles were thrown in the disturbance at the Epsom Downs Racecourse on 4 June. The all-male group, charged in connection with disorder near a music stage, is due in court over the next four weeks. During the violence a police officer's tooth was knocked out. He had to be treated in hospital for his injuries. Those charged are aged between 16 and 20. About 100,000 race-goers attended the two-day festival.
summary: Eleven people have been charged following a fracas at last year's Epsom Derby.