Detectives investigating a report of indecent exposure in Ealing have released an e-fit image of the man they want to identify.
On 17 June, an 18-year-old woman was walking on the footpath next to the River Brent near Ruislip Road, when she noticed a man close to her who was naked from the waist down.
The victim, although shocked, was not harmed. The suspect fled along the canal in the direction of Gurnell Grove.
The suspect is described as being of Asian or Middle Eastern appearance, possibly aged 30s, with black medium length hair and of average height.