Police investigating a serious sexual assault on a man walking home in Southampton have released CCTV pictures of a potential witness.
The 32-year-old was attacked near Goals 5-a-side at Millbrook Park, Southampton, after 0200 GMT on Friday.
Two men followed him, threatened him with a knife and assaulted him.
Police think a man who used the cash machine at the nearby Texaco Petrol Station at about 0335 GMT could be an important witness.
The victim had been walking home after an evening out at Leisure World in Southampton and left Grosvenor Casino at about 0200 GMT.
As he passed Millbrook Park he was verbally abused by a gang of about five men before some of them drove off.
'Very few teeth'
Detectives said two of them then followed him and one of them grabbed him and twisted his left arm behind his back while the other held a small knife, described as a pen knife, to his face.
The second man then sexually assaulted the victim before both suspects walked off.
The first man was described as Asian, with a pony tail and in his 30s. He is about 5ft 11in tall, of slim build, and was wearing a dark jacket and trousers.
The other man was described as white, in his early 40s, about 5ft 11in tall, stocky build and wearing a light coloured jacket.
The victim described him as having "very few teeth".
Det Insp Roger Middle said: "The Texaco petrol station is near to where the incident happened and there is a very good chance this man may have seen those involved and be a vital witness.
"This was undoubtedly a very unusual type of attack and we want to find those responsible as soon as possible".