A clubber suffered a suspected broken nose and cuts to his face after he was attacked in a Northampton nightclub.
The attack happened between 2am and 2.30am yesterday in Groove in Gold Street.
The victim, a 20-year-old man, was walking through the nightclub when he was pushed from behind and then punched to the face.
Police are hunting a mixed race man, aged 20-25, between 5ft 8ins and 6ft. He was slim with a toned build and short dark hair and he was wearing jeans and a grey or brown top.
Anyone with information can call Northamptonshire Police on 101. Alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.