A 31-year-old woman was sexually assaulted by a man after going into a public toilet in Southampton.
The woman, who uses crutches to walk, was attacked as she used the disabled toilet at the back of Burger King in Castle Way last Thursday evening.
The attacker fled the scene. He is described as white, in his late 40s or early 50s, of medium build, about 5ft 5in (1.65m) with short grey hair.
Police are appealing for anyone with information to contact them.
Detectives said full details about the attack had only recently come to light.
Det Insp Gary Towse said: "This is an unusual attack that occurred in the middle of the morning in a busy part of the city centre on a vulnerable victim.
"It is important we find the person responsible for this crime."
Extra police patrols were being carried in the area, a spokesman added.
Southampton City Council staff are making regular checks of public toilets.