A man has been arrested after the deaths of a teenager and two young children following a violent incident in Dublin.An 18-year-old woman and her brother and sister, twins aged eight, died after an incident at a house in the west of the city.

A man has been arrested after the deaths of a teenager and two young children following a violent incident in Dublin.An 18-year-old woman and her brother and sister, twins aged eight, died after an incident at a house in the west of the city.