A group of four men attacked a 52-year-old in St Neots in the early hours of Saturday (August 2).
The victim was walking along Navigation Wharf away from the town centre at about 2am when he was attacked.
One of the group spoke to him before he was punched to the side of the head. All four men fled the scene.
The victim suffered slight injuries and was treated in hospital.
INFORMATION: Anyone with information should contact DC Karen Moulds on 101, or Crimestoppers, anonymously, on 0800 555111.
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