Two children have been found dead at a Perth home and their father remains in hospital with life-threatening stab wounds, with police saying they are not looking for anyone else in connection with the deaths.
The bodies of the three-year-old boy, five-year-old girl and their father were discovered by officers who forced their way into the home on Flight Vista in Yanchep, in Perth's north about 10:30pm on Thursday.
The man, 35, is under police guard in hospital where he remains in a critical condition with self-inflicted wounds.
"His injuries were fairly significant and he is requiring some fairly intense medical attention," Acting Detective Inspector Peter Clements said.
Police would not reveal how the children died, but said they were "not looking for an unknown offender".
Detective Inspector Clements said the mother of the children was distraught.
"We have a family liaison officer who has been appointed. We are in direct contact with her now," he said.
"Obviously [she is] very, very distressed so we are doing what we can at this point in time to provide support, not only to her but to the police officers who attended."
Police declined to say what led them to the house, and said the events which led to the children's deaths were forming part of their investigation.
Coline Cooper, who lives several houses away, said officers knocked at her door about midnight to ask if she had heard anything, but she had not.
She said she believed the children were quite young and that their mother was a fly-in, fly-out (FIFO) worker.
"The last I heard is that there were a couple of children and they had both died and that his wife or partner works away FIFO," she said.
"It's awful. I mean it was bad enough when you think just one person was involved, but now there's children involved it's horrible."
Another neighbour, who wants to remain anonymous, described the incident as devastating.
"I really feel sorry for the wife coming home to this. I don't know how she is going to cope with that.
"I can't put myself in her shoes. No, it's terrible."
Major Crime police have cordoned off the house and forensic officers remained at the scene throughout the night.
Children found dead at Perth home, father under police guard in hospital with self-inflicted injuries Graeme Powell Briana Shepherd Oct 21 2016