Three teenage bullies who attacked another girl, set fire to her hair extensions, and posted a video on the internet have escaped with police warnings.

A 17-year-old girl and a 16-year-old girl beat up their 15-year-old victim in front of a crowd at Hesketh Park in Dartford on July 11.

A 10-second clip posted on Snapchat shows the younger girl being punched and kicked before being thrown to the floor.

A second video shows a girl setting fire to the victims hair extensions.

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On August 25 the 17-year-old girl and the 16-year-old girl both received cautions for assault.

A 15-year-old girl was issued with a harassment warning.