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Police in Colchester have issued an efit of a man they want to trace after a sex offence.
It happened in an alleyway off Hamlet Drive back in June.
A woman was in her garden when she saw the man performing an indecent act on himself.
He was stood in the alleyway, looking through a gap into her garden.
He ran off when he realised she had seen him.
He is described as white, with dark brown short cropped hair.
He was in his early 20s, of slim/medium build and was wearing a dark blue denim shorts, a grey t-shirt and had light stubble on his face.
If you recognise the man please call Pc Keith Sargeant at Colchester on Essex Police 101.
People can also leave details anonymously by calling independent charity Crimestoppers on 0800 555 111.