The victims have been named locally as Vanessa Whyte and her children, James and Sara.
The killings of a woman and her two young children in Co. Fermanagh have been described as devastating.
The victims have been named locally as Vanessa Whyte and her children, James and Sara.
Ms Whyte was found dead alongside one of her children at a house in Maguiresbridge yesterday.
The second child died later in hospital.
A man who was also found inside the house is being treated in hospital for serious injuries.
PSNI Superintendent Robert Magowan says they are investigating a suspected murder and attempted suicide.

Further Increase Expected In Number Of Landlords Leaving Property Market, As Price Of Three-Bed Semi Rises In Kildare
Over 1,700 Garda Checkpoints In Operation Over Christmas Period, With Naas RPU Detecting Multiple Speeding Motorists
€1.2m Approved For Zipline And High Ropes Adventure Centre At Donadea
Christmas Appeal To Adopt Dogs As Euthanasia Figures Rise
Speed Enforcement To Increase In Kildare With 21 New Camera Zones To Be Rolled Out In January
Over 400 Motorists Caught Speeding So Far Today, Including A Driver In Kilcock
Transport Minister In Discussions With Irish Rail About Extending Late-Night Trains Beyond Christmas
Tadhg And Mary Should Be Looking Forward To Christmas, Say Gardai As Fresh Appeal Launched