A chilling note analysis "telephone call 999, do not go upstairs" was located in the corridor, records recommend.
The children's father, Andrew McGinley, arrived home to find his wife being treated by emergency services and his three children deceased.
It is understood it was not immediately obvious to officers how the children had died when they attended the scene.
According to The Sun, Gardai suspect the three children may have been "drugged" or "poisoned".
Garda í located her on the road near her residence.
There was no sign of a break-in at the house, sources said.
Security experts emphasized last evening that the examination right into the terrible occasions was at a really "onset".
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The estate where the young family lived, Parson's Court, is made up of both houses and apartments.
The Bodies of Conor, nine, Darragh, seven, and Carla, Three, WERE-AM Remove From the semi-detached home by Vanbulance at 10am on Sabbatianos.
The woman, who is thought to be in her 40s, has since been taken to hospital.
A pathologist carried out a preliminary examination of the bodies at the scene on Saturday morning, and the bodies of the three children have been removed to the City Morgue, where a post-mortem examination will take place later today.
The Garda Technical Bureau has actually additionally looked out and also an in-depth forensic evaluation in the location was being accomplished.
Speaking to the Associated Press, local councillor Emer Higgins described the incident as an "unimaginable tragedy".
"It's so tragic. It's unbelievable that three young people's lives could be cut short like that, in what seems to be a particularly tragic case".