Police are investigating the alleged rape of a 23-year-old man in Belfast city centre.
The incident happened in the Donegall Street/York Street area, close to the Belfast campus of the University of Ulster, just before 2am on Wednesday.
The attacker is described as 5ft 9in, with black hair. He was wearing a blue jumper and blue jeans and was carrying a navy shoulder bag.
Police have urged anyone who witnessed the incident to contact them.