DETECTIVES have mounted a investigation following a brutal attack on two friends which left one in hospital last night fighting for his life.

More than 30 detectives began house-to-house inquiries in Leadgate, County Durham, following the assault early yesterday.

A local man in his 40s, who is understood to be Joe McCardle of an unknown address, was last night critically ill with head injuries.

The other man, who is believed to be Tony Lavery, of Park View Villas, Leadgate, was treated and discharged.

Police were called to Mr Lavery's home where Mr McCardle was found unconscious with extensive injuries, including a fractured skull.

Mr Lavery, who had gone to find a telephone, was found by an ambulance crew outside the Alldays Supermarket in the town's Front Street, shortly after 1am.

Detective Superintendent Harry Stephenson, who is leading the inquiry, said he believed the two men were inside the house in Park View Villas when they were attacked.

He said the motive for the attack was still unclear.

Detectives believe Mr Lavery, who is in his 30s, may have been helped to a public telephone to call the ambulance service for help.

A group of five people - three men and two women - were gathered around the victim when the ambulance crew arrived.

One of the women has been traced, but Det Supt Stephenson said he would like the remaining three men and woman to contact police as a matter of urgency.

One neighbour, who did not wish to be named, said she had not heard anything untoward, but had later seen Mr McCardle being taken away by ambulance.

A shop assistant, who also did want to be identified, said Mr Lavery was well known in the village, but she had only recently seen Mr McCardle for the first time.

The night before the attack, the two victims had been in the shop to buy cider, she said.

Det Supt Stephenson said: "The man who was the most seriously injured suffered a fractured skull and underwent surgery at Durham's University Hospital at about 6am yesterday.

"He remains on a life support system in the hospital's intensive care unit."

Anyone with information can contact police on (01207) 504204 or Crimestoppers on 0800 555111