An Asian man forcibly kissed a 14-year-old girl in front of her friends in Manor Park, near Sutton town centre, at about 7pm on Tuesday night.
The attacker, with the words “sun” and “come out” tattooed on his hands, was aged about 40, 5ft 7in, of medium build, and wore a black leather jacket.
Anyone with information is asked to call Detective Sergeant Kate Wilson at Sutton CID on 020 8649 0747.
Alternatively, call Crimestoppers, anonymously, on 0800 555 111.
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