A teenager was punched in the face after being threatened with a penknife.
It happened just before 8pm on September 14 near to the Icknield Way junction in Thetford.
The boy and a friend were threatened by a group of men who had a penknife and the 13-year-old was punched in the face.
The offender is described as a white man and was wearing a blue polo shirt.
Anyone with information should call PC Dan Rayner on 101 or Crimestoppers, anonymously, on 0800 555111.
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