A man has been arrested after the bodies of two elderly brothers in were found in a house in Castlebar, Co Mayo.
He is being held at Castlebar Garda Station.
The brothers have been named as 76-year-old Jack and 69-year-old Tommy Blaine.
Their bodies were found in the house on New Antrim Street at around 7am after gardaí were alerted by a home-help assistant who cared for the men.
One of the men was found in a downstairs bedroom and the other was in the back yard of the terraced property.
Gardaí are treating the deaths as suspicious.
The men have been described as quiet, inoffensive people who minded their own business and never harmed anyone.
They had lived in the Castlebar area for many years.
The brothers had spent time in England, but returned home to Mayo to look after their mother around 30 years ago.
Gardaí are examining CCTV footage from the area in an effort to piece together their last movements.
They have appealed to anyone who may have noticed suspicious behaviour around Castlebar last night or this morning to contact them.
A number of people have come forward, but gardaí are still anxious to hear from others who may have been near New Antrim Street between 9pm last night and 7am this morning.
Superintendent David Taylor said people in the town could be assured that every step would be taken to bring those responsible for the deaths to justice.
Taoiseach Enda Kenny has said he shocked by the deaths of the men in his home town.
He said he has spoken to gardaí who were following several lines of inquiry and hoped those responsible would be brought to justice.
A garda technical examination of the house took place this afternoon and the State Pathologist is at the scene this evening.
The men's bodies will be taken to Mayo General Hospital for post mortem examinations.