Three sisters have been killed and a teenage boy seriously injured following a "violent incident" at a property in Dublin, police have said.
A teenage girl, and her two younger siblings were rushed to Children's Health Ireland (CHI) in Crumlin, tragically all three were later pronounced dead.
Police were called to a property on the Rossfield Estate in Tallaght at around 12.30am on Sunday. Officers described the incident as violent, challenging, and traumatic.
A teenage boy at the property was also taken to hospital with serious injuries, however, they are not believed to be life-threatening.
The Garda Armed Support Unit arrested a man in his early 20s at the scene.
The suspect, who has not been named, is currently being held at Tallaght Garda Station under Section 4 of the Criminal Justice Act 1984.
The mother of the children, who was not thought to have been injured in the incident was also taken to CHI.
Garda said that those involved were all believed to be known to each other and officers are not searching for anyone else in connection to the incident.
A senior investigating officer is leading the investigation from an incident room in Tallaght.
The scene in Rossfield Estate remains sealed off and a forensic examination is underway by the Garda Technical Bureau.