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A teenager was assaulted by two men in an alleyway as he walked home from a friend's house in Larch Walk, Kennington, Ashford.
The 18-year-old was left with an injured arm and hip after the unprovoked attack, which took place between 11pm and 11.40pm on Monday 28 July 2014.
The offenders are said to have grabbed him, wrestled him to the floor and assaulted him.
Police have today released an efit of one of the attackers.
Detective Constable Kay Brown said: "This was a callous attack that could have resulted in far more serious injuries to the victim.
"We are keen to track down those responsible and are hopeful the computer-generated image released today will result in people coming forward with information."
Witnesses or anyone with information are asked to call DC Kay Brown on 01303 289428 quoting crime reference ZY/24898/14. Alternatively call Kent Crimestoppers anonymously on 0800 555 111.