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A 14-year-old boy was the victim of a serious assualt as he walked with friends along Kingsdown Park, Whitstable.
The incident occurred just after 9.30pm on Friday, February 3, when a group of around a dozen young men approached the boy.
Police spokesman Michael Ivatt said: "There was verbal altercation before the victim was punched to the ground and then kicked."
The chief offender is described as a being aged between 14 to 17 and wearing a white hooded top and white trainers.
Anyone who can assist police is asked to contact PC Jennifer Would on 01227 762055.