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Dramatic footage of teenage boys fighting with knives in front of horrified onlookers at a fast food restaurant can be seen for the first time.
CCTV shows how the rival gangs lashed out at each other with a flurry of kicks and punches inside McDonald's in Penge, south-east London, knocking over an elderly woman during the melee.
The teenagers, armed with knives, race into the takeaway, attempting to stab each other, and continue to fight in the doorway and outside on the pavement.
One of the participants of the violence was later jailed for his part in the fatal stabbing of 17-year-old Karl Yule in Gillingham, Kent on October.