A post mortem examination's taking place today on the body of a baby boy who was killed in te Ardoyne area of north Belfast on Tuesday night.
A two-year-old girl's fighting for her life in hospital, after being seriously injured in the incident.
A 29-year-old woman was arrested on suspicion of murder and attempted murder, and remains in police custody.
It's understood the children's father returned home from England yesterday.
Former US Marine Jailed After Grooming and Abusing Wicklow Teen
Wicklow Property Prices Rise by €7,500 In One Year
Peter Thiel Event Will Not Go Ahead In Wicklow Hotel
Wicklow Receives €10.72 Million to Repair Roads Damaged by Storm Chandra
Wicklow Apprentice Wins ESB HGV Mechanic Apprentice of the Year