A 22-year-old man from Hull suffered a fractured jaw after being assaulted whilst in a city bar.
The victim was in the Soho bar on Posterngate, Hull when the incident occurred shortly after midnight on Wednesday 24 December.
It is alleged he was with friends in the venue when a man approached him and punched him to the side of the face before making off from the bar in an unknown direction.
The victim sustained a fracture to the jaw below the chin and a second fracture to the right side of the jaw which required surgery and a stay in hospital.
The suspect is described as a white man, aged in his 40s, heavy build, bald headed and wearing a red jumper.
Police are investigating the incident and are seeking witnesses and information. Anyone who can assist is asked to contact Humberside Police on the non emergency number 101 referring to log 9 of 24 December 2014 or call Crimestoppers on 0800 555 111.