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A man allegedly used a blunt instrument and knives to murder his three young daughters, their mother and grandmother and then stayed with the bodies in their Perth house for days before heading north.
The bodies of Mara Lee Harvey (41); her three-year-old daughter, Charlotte; two-year-old twins Alice and Beatrix; and their grandmother, Beverley Ann Quinn (73); were found at a Bedford home on Sunday.
It is alleged Anthony Robert Harvey (24) killed his wife and children on September 3, then killed his mother-in-law the next morning when she arrived at the house in the third domestic mass killing in Western Australia in four months.
Their remains were discovered on Sunday after Harvey turned himself in at Pannawonica police station, some 1500 kilometres north of Perth in the Pilbara region.
The visit prompted police to visit the Coode Street home where they discovered the bodies about midday.
The murders come after the shooting deaths of three adults and four children, all from the same family, in Osmington in regional WA in May.
In July, a mother and her 15-year-old daughter and eight-year-old son were murdered at Ellenbrook, in Perth's outer northeast.
WA Police Commissioner Chris Dawson told reporters that several weapons were used, including a blunt instrument and knives, but no guns.
The women were allegedly attacked in the kitchen, while the children were killed elsewhere in the house.
A bearded Harvey appeared in Perth Magistrates Court on Monday via video link from Karratha courthouse, and was remanded in custody to appear in Stirling Gardens Magistrates Court later this month.
A bouquet of red roses with a card saying "rest in peace, neighbours" has been placed near the house.
A young father, who is building a house nearby, told AAP: "I've got a two-year-old girl - I can't rationalise anything that would cause someone to do that."
An elderly woman who also lives nearby said: "I don't know what's coming to this world."
A couple who live a few doors down from the house said they were horrified when police came knocking and told them what had happened.
An elderly man who has lived in the neighbourhood for decades said it was "normally a quiet place".
Deputy Premier and Health Minister Roger Cook said it was not yet known whether there was a common cause between the three tragedies, but added that mental health was an increasingly challenging issue.
"We have limited resources, we are constantly looking at new ways that we can apply those resources to provide the appropriate level of support," Mr Cook told reporters.
"I want everyone just to hug their kids, hug their family today. This is a horrible event and it's very upsetting."