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A teenage boy was attacked after a black car pulled up and four people set on him.
Police are appealing for witnesses to the assault, in Dartford, which happened on St Alban's Road.
The victim was walking with another boy, between 4.30 and 5pm, when the car stopped and four people got out and launched into the attack. Members of the public intervened.
A 38-year-old woman, a 17-year-old boy, a 16-year-old girl and a 12-year-old boy were arrested in connection with the incident and have been released on bail until June 17 while officers carry out an investigation.
The victim was not seriously injured during the assault. It happened on Thursday, May 11, but details have only just been released by the force.
Witnesses to the incident are urged to call the appeal line on 01474 366149 quoting reference XY/22194/17. Alternatively contact Kent Crimestoppers anonymously on 0800 555111.