The incident occurred between 4pm and 4.30pm within a secluded area of wasteland toward the rear of the Nuffield car park on Lansdowne Road. The victim was a 33-year-old Bournemouth woman.
Detective Constable Richard Skinner, of Bournemouth CID, said: “Following enquiries, I am now able to release two images of a man I would like to speak with. The man pictured is around six feet tall, with short black hair and is wearing a white shirt, blue jeans and three quarter length black jacket.
“I would like to reassure members of the public that this was an isolated incident and there is no risk to anyone using this car park.
“I would urge the man pictured – and anyone who recognises him – to contact me in confidence.
“I am also appealing for anyone who witnessed the incident, and anyone with any information about the person responsible, to contact police as soon as possible.”
Witnesses and anyone with information should call Dorset Police in confidence on 101 quoting incident numbers 19:289. Alternatively, call the free and anonymous Crimestoppers line on 0800 555 111 where mobile phone tariffs may apply.