Gardaí have launched a major criminal investigation after the body of a man was found in his home in south Dublin this morning.

A post mortem examination has yet to be carried out, but it is believed the victim may have suffered a gunshot wound or wounds and has been dead for a number of days.

The scene at Rockbrook Cottages between Edmondstown Road and Cruagh Road in the Rathfarnham area was sealed off throughout the day as garda crime scene examiners attended the house where the body was found.

The body was found in a bedroom at around 10.30am when a friend called to the house.

The friend was alerted by family members who were concerned as they had not seen the man for some time.

The last reported sighting was on St Patrick's Day in Templeogue.

No weapon was found at the scene and an extensive criminal investigation has been under way throughout the day.

A full post mortem examination will be carried out at Connolly Hospital Blanchardstown.

The man, believed to have been in his 40s, had lived at the house for a number of years.

He was a single man, who worked as a mechanic, and was originally from the Templeogue area.

Members of the National Bureau of Criminal Investigation are involved in the investigation as well as detectives from Rathfarnham, Terenure and Tallaght.

The State Pathologist Dr Marie Cassidy visited the scene earlier.