Detectives are appealing for witnesses following a serious assault in the Cornshell Fields area of Derry during the early hours of this morning.
Shortly after 2am it was reported that a 28 year old male was attacked in a house in the area.
The victim was taken to hospital for treatment for potentially life threatening injuries where his condition is described as critical.
Three other men and two women, who were also in the house at the time, were not injured.
Four males, who are believed to have been involved in the incident, are reported to have made off in a grey coloured Volkswagen Golf.
Detective Sergeant Richard Donnell is appealing for anyone who witnessed the incident or anyone who may have seen a grey coloured Volkswagen Golf in the area at the time to contact Detectives in Strand Road on 101