Norfolk Police are appealing for information after a 13-year-old boy was assaulted in Thetford.
The attack took place at around 8pm on Friday 14 September, on on Bury Road, near to the Ickneild Way junction.
The boy and a friend were threatened by a group of men, on of whom had a penknife. The boy was punched in the face.
The attacker is described as a white male and was wearing a blue polo shirt.
Calls with information on the incident can be made to PC Dan Rayner on 101, or Crimestoppers anonymously on 0800 555 111.