A man was taken to hospital with serious injuries after an attack in Sheffield.
The 20-year-old was one of four men approached by three other men as they walked along Brocco Bank, near Hunters Bar, in the early hours of Monday, June 12.
Two men, both 20, were both assaulted.
One was taken to hospital with serious injures, the other escaped with minor injuries.
A South Yorkshire Police spokeswoman said: "It was reported to police in the early hours of Monday, June 12, a group of four men were walking on Brocco Bank, near to Hunters Bar in Sheffield, when they were approached by three men.
"Two men were assaulted by the group of men, who then made off from the area.
"The two men, both 20-years-old, suffered injuries in the reported attack. One of the men suffered minor injuries, whilst the second man suffered serious injuries and was taken to hospital to receive treatment.
"Officers are currently investigating and making enquiries in the area.
"If you were in the area at the time or witnessed the incident, please contact the police."
Call 101 quoting incident number 30 of June 12 or Crimestoppers on 0800 555111.