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19 February 2011, 07:46 | Updated: 2 March 2011, 14:37
A boy aged 13 is among 19 people who've been arrested and bailed over a massive fight in Trafalgar square.
Three teenagers were stabbed on Thursday afternoon.
Witnesses say they saw gangs fighting with hockey sticks and knives.
The Met police say they will not tolerate this kind of violence.