A 20-year-old man was bitten on the nose when he was attacked by three men, one of whom was wearing pyjamas.
The assault happened in Barracks Lane just before 6pm on Sunday and the victim was treated for the bite and bruising on his forehead at the John Radcliffe Hospital.
Police described one attacker as a white man in his 50s wearing pyjamas. Another was said to be a white man in his 20s, 5ft 10ins, with a skinhead haircut. The other was described as a skinny black man in his 20s and about 6ft tall.
Call Dc Emma O’Dell on 101.