Police Scotland described the attacker as having light grey hair and a moustache.
A manhunt has been launched after a 15-year-old girl was sexually assaulted at a bus stop in West Dunbartonshire.
Police Scotland said the man approached the schoolgirl and touched her inappropriately.
The incident occurred in Clydebank’s Faifley Road - near the junctions of Langfaulds Crescent and Langside Street - at around 9pm on Saturday.
The attacker is described as slim, between 5ft 8 and 5ft 10ins tall, and had light grey hair and a moustache.
He was also said to be wearing a black puffer jacket, black trousers, and black trainers or boots.
Detective Constable Georgia Callander said: "We are working to trace the man responsible and would urge anyone who may be able to help to come forward.
"I would also ask anyone in the area at the time who may have dashcam footage to get in touch."