Gardaí are awaiting toxicology reports today after the deaths of two women in Dublin yesterday.
Bridget Heffernan who was in her seventies and her daughter Margaret (39) were found dead by a relative in their home at Kirwin Cottages, Stoneybatter yesterday morning.
Bord Gáis said that a preliminary examination of the scene of the deaths showed there was no evidence of a gas leak. A Garda spokeswoman said the deaths are not being treated as suspicious.
It is now thought that a faulty heating system may have caused a buildup of carbon monoxide that led to the women's deaths.
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Post mortem have been completed, a Garda spokesman said.