Officers are appealing for information in connection with a sexual assault in Birkby, Huddersfield.
They want to speak to anyone who witnessed the incident which took place at about 9.45am at the junction of Birkby Road and Halifax Old Road on Monday, June 3.
It occurred after the victim - a 38-year-old woman - was sexually touched from behind by a man while walking at the junction.
The suspect then mouthed some words to her before walking off towards Spaines Road.
He was described as asian, in his late 30s and around 5ft 6ins tall, of medium build with a slight belly and short dark hair.
The man was wearing a long sleeved green T-shirt, pale blue denim jeans and brown shoes and was clean shaven.
Anyone who has information should contact DC Shaun Lewis at Huddersfield CID on 101 or CrimeStoppers on 0800 555 111.