A 42-year-old man suffered serious head injuries after being punched and kicked by another man in a “vicious” attack in Hamilton.
The incident happened outside flats in George Court at about 15:15 on Thursday.
The victim was taken by ambulance to Hairmyres Hospital but was later moved to the Queen Elizabeth University Hospital in Glasgow for treatment.
Hospital staff have described his condition as stable.
The suspect, who walked off after the attack, was described as being about 6ft tall, of slim build. He was wearing a black tracksuit top with white stripes on the arms, black tracksuit trousers and white training shoes.
Det Con Stewart Walton said: “This was a vicious attack which has left a man with serious injuries to this head.
“We are currently reviewing CCTV footage to help identify the person responsible and inquiries so far have revealed that there were many people in the vicinity at the time this assault took place.
“I urge these people to come forward immediately as they may have information that could assist our inquiry.”