A woman was the victim of an indecent exposure in Milton Keynes on Monday.
The 29-year-old woman was walking from the railway station towards Bradwell Common via the underpass.
As she approached the underpass, she saw a man standing on his own to her left and as she got closer, the offender turned around revealing that he was touching himself inappropriately.
The victim immediately called the police and the offender fled the scene in the direction of B&Q Rooksley.
The offender was a white man, aged between 18 and 25 years old, about 5ft 6ins to 5ft 7ins tall.
He had short wavy ginger hair, was clean shaven and wearing jeans with a hooded lightweight waterproof jacket that was green and black.
Anyone with any information is asked to contact investigating officer PC Shannon Smith from Milton Keynes police station via 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.