A man is in a critical condition in hospital today after being assaulted in Derry early this morning.
Police received a report of the assault at 5am and found the victim in the Rosemount area of the city. He was taken to hospital for treatment for serious head injuries.
A spokeswomn said four youths were seen running from the scene. The area around Rosemount Avenue and Epworth Street has been sealed off as part of the investigation.
Officers in Strand Road have appealed for anyone with information about the attack to contact them.