Lincolnshire Police are appealing for witnesses after a 20-year-old man was assaulted in Skegness.
The incident happened at around 1.25pm on Monday, January 23 in an alleyway between Burgh Road and Albany Close.
The 20-year-old is described as dressed all in black.
A man who was walking through the alleyway with another man has been treated in hospital for his injuries.
Anyone with any information that may help the Investigating Officer is asked to contact PC 163 Bates by calling 101.