The Gurteen community is completely stunned after the bodies of the man and his two children, aged 12 and nine, were found inside the house in Gurteen last night.
The scene of the incident remains sealed off as Gardai and fire crews investigate the deaths.
The source of the carbon monoxide poisoning has not been established.
It comes just two weeks after a jury in Co Donegal returned a verdict in the deaths of two Glenties pensioners who died from gas leaking from a cooker.
“This is an awful tragedy,” said one source. “The investigation is still ongoing so the source of the deadly gas hasn’t been fully verified.”
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