A middle-aged man and his two children have been found dead in a house.
The three bodies were discovered in a house at Moygara, Gurteen, in Co Sligo, last night.
A local doctor pronounced them dead in the home after the alarm was raised at about 9.40pm.
The man was aged 52, his daughter 12 and the son nine, local officers said.
A Garda spokesman said the scene at the house has been sealed off pending a full technical examination by forensic officers.
The State Pathologist’s office has also been notified.
It has been reported locally that there may have been a gas leak in the home. Early investigations have also centred on possibilities that the leak may have involved carbon monoxide.
Crews from the local fire service attended the house last night and may be asked to return to the scene today.
Post-mortem examinations are also expected to be carried out later.
The family are believed to be originally from England and moved into the area some years ago.
They had been living in an isolated county council house about one mile from the village of Gurteen.
It is understood the man’s wife is ill in Sligo General Hospital.
Neighbours are believed to have raised the alarm with local gardaí after smelling gas last night.
Gerry Murray, a Fine Gael councillor living in the area, said the small community of about 300 people has been left stunned.
“The details of the deaths we don’t know, but I do know that the village of Gurteen is very upset,” he said.
The man was found dead alongside his two children in the living room. It is believed he had been sitting in an armchair.