A Yanchep resident has spent a sleepless night at home after hearing that two children - his new neighbours - were killed as he sat nearby watching TV .
Major Crime detectives forced entry to the children's Flight Vista home about 10.30pm on Thursday night to find the bodies of the three-year-old boy and five-year-old girl.
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Two children dead after violence at Yanchep home
Police are investigating a suspected double murder in Perth's north - with officers cordoning off a home in Yanchep. Vision: Today Perth News
They also found their critically-injured father, a man in his 30s who now lies under police guard in Royal Perth Hospital.
While the investigation is just beginning, police are not looking for a third party.
WAtoday spoke to a neighbour, a father in his 50s, who said the family had just moved into the estate.
"We didn't know who they were," he said.
"It's a very new suburb so they'd only just moved in.
"We didn't even know they had kids until it happened."
He told WAtoday police knocked on his door at midnight and asked what he had heard.
"Earlier I thought I'd heard some voices raised, like a woman screaming, but I had thought, 'nah, that's just the television'," he said.
"Later when I went outside to have a coffee, it was totally quiet, I couldn't hear anything.
"After the detectives had a chat with us, they said they'd be going all night and they would try to be quiet but it didn't matter... I couldn't sleep anyway.
"It's such a surreal feeling, a very terrible thing to happen.
"When I heard it was a man who'd been injured, I felt bad for him but later when police mentioned it was two kids who'd been killed, then that was far, far worse.
"It doesn't seem real, it's not the sort of thing that usually happens on your doorstep."
Anyone with any information is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestopperswa.com.au.