A Dereham resident was jumped on and pushed to the ground when he asked a group of four people to quieten down.
The victim, a man in his 30s, suffered grazing when he was assaulted in Shipdham Road, Toftwood, at about 1am on Sunday, January 16.
Witnesses are asked to call PC Stacey Murray at Dereham Safer Neighbourhood Team, on 0845 456 4567 or Crimestoppers anonymously on 0800 555 111.
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