Two girls are dead and a six-month-old baby is in the hospital for smoke inhalation after a fire at the Victoria police house said it appeared to be an accident.
The fire started around 8 a.m. Thursday at the Loch Street property in Geelong East.
Geelong CIU's senior detective sergeant, Mark Guthrie, told 3AW he was early in the investigation, but that it appears to have been triggered by a small electric bar heater.
The girls, two and three, were taken to the hospital by the parents, where they were declared dead.
The fire was under control at 8.12 a.m.
"It's very early in the investigation," said Senior Detective Sergeant Geelong CIU Mark Guthrie.
"This indicates that it is only a tragic accident.
"There was a small heater that fell in the room where these two children were in the room."
The six-month-old girl was in another room of the house, where the parents were also.
"They're all good," said Det Sen Serg Guthrie.
The baby was taken to the hospital by ambulance for smoke inhalation in a non-fatal condition
The premeditated detectives are trying to determine the cause of the fire, although it is not believed to be suspicious.
Loch Street is closed between St Albans Road and Kilgour Street.
The police investigation is ongoing and the arsonists are evaluating the scene.