The three kids that were found dead at house in Newcastle in south Co Dublin have been named locally as Conor (aged 9), Darragh (7) and Carla (3) McGinley.
The bodies of tragic siblings were discovered by gardai last night.
A woman, understood to be their mother, was taken to hospital after being found disorientated on the street by a taxi driver.
The woman, aged in her 40s, is currently in Tallaght Hospital.
The bodies of the kids have been removed to the city morgue where a post-mortem examination will take place later today.
A garda spokesman said: “At approximately 7.45pm Friday 24 January, 2020 Gardaí responded to a call at Parson’s Court, Newcastle, Co. Dublin.
“Ambulance personnel and responding Gardaí discovered the bodies of three children in the house, brothers & sister Conor (aged 9), Darragh (7) and Carla (3) McGinley.
“The scene is currently being examined by members of the Garda Technical Bureau. Assistant State Pathologist Margot Bolster has attended the scene.
“The bodies of the three children have been removed to the City Morgue, where a post-mortem examination will take place later today.
“The results of the post mortem will determine the cause of death of the 3 children.”
A note was found on the door of the house with the message: “Don’t go upstairs…call 999”, it was then gardai made the tragic discovery.
As news of the tragedy emerged there was a sense of horror and disbelief among local people.
One neighbour said: “It doesn’t seem real. I’ll be honest we’re shaking.”
A book of condolence has been opened in St. Finian’s Church this morning and the community will be coming together for a mass at 10am.
The church’s priest Fr Kevin sent out a message last night and sent prayers to the children and their family.
He said: “This is the saddest of nights. The devastating news has brought tragedy and darkness into our community.”
It is understood gardai entered the home at Parsons Court after the mother was discovered shortly after 7pm.
They believe the children may have been drugged or poisoned.
A number of relatives of the family arrived at the gruesome scene and looked distraught and ashen-faced as they spoke to detectives.
Many residents were too shocked to talk to reporters.
One woman, who did not want to be identified, said: “I only found out five minutes ago after my brother rang because it was on the news.
“I was oblivious [because we live in the corner] so I didn’t know anything.”
She was with another neighbour who added they were “trying to piece it together ourselves”.
She said: “I have kids upstairs, she has kids next door.“I actually was worried because she has three kids as well and I didn’t know who it was. I don’t know anything yet and it hasn’t sunk in.”
The two friends revealed the family moved into the estate about a year ago.
The second woman added: “I don’t think we’d know them to see them because our children are younger as well.
“It’s a quiet estate. I think it’s an understatement to say we’re shocked.
“I’m sure more details will emerge in the morning but I think tonight everybody is just like… I can’t believe it’s in our doorstep.”