A woman has been left shaken after being assaulted by a man who tried to engage her in conversation.
The attack took place in Kilmarnock, Ayrshire, in the early hours of Sunday.
The 24-year-old victim was walking along Bonnyton Road at around 12.10am when she was approached and followed by the man on a bike.
After she rejected his attempt to strike up a conversation and get her attention he continued to follow her towards a nearby railway bridge where he assaulted her.
The man is described as being in his mid-20s and around 5ft8.
He spoke in broken English and is thought to be of Eastern European descent.
After the attack he cycled off in the direction of Warwickhill Road.
Detective Inspector Stuart Dougan said: “I am appealing to anyone who was in the area at the time or who saw a man matching this description on a bike to please come forward if you have not already.
“If you are a local resident and have CCTV or a driver with a dash-cam, please check back and see if there is any footage that could assist our enquiries.
“Information can be provided by calling us on 101.
“I would like to reassure members of the public that this is believed to be an isolated incident and we are doing everything we can to identify the man responsible.
“Our officers will continue to patrol the area over the coming days. If you have any concerns, or any information in relation to the incident, please do speak to them or contact police on 101.”