The Garda Commissioner says the investigation into the violent deaths of three siblings in Tallaght in Dublin is one of the worst incidents he has ever come across.
A man in his early 20s, who's well known to the victims, continues to be held at Tallaght Garda Station in connection with the deaths.
8-year-old twins Christy and Chelsea Cawley were stabbed to death in their home, along with their 18 year old sister Lisa Cash.
Commissioner Drew Harris says help will be given to their staff who attended the scene.
