Thames Valley Police is releasing a CCTV image in connection with an assault in Milton Keynes.
The incident occurred at around 5.05pm at The Centre, near to Braids Barbers on Saturday (2/4).
The victim, a boy in his teens, was sat on a sofa inside the shopping centre when he was approached by a group of older males.
After discussions have taken place, two men from the group punched the victim in the face, causing a swollen right eye and a tooth to be knocked out.
The victim was treated at Milton Keynes University Hospital and has since been discharged.