Four children are among seven people found dead at a rural property south of Perth.
West Australian Police Commissioner Chris Dawson said officers were called to the property at Osmington, about 20km northeast of Margaret River, at about 5.15am on Friday.
“Police are currently responding to what I can only describe as a horrific incident,” he told reporters in Perth.
Mr Dawson described the deaths as a tragedy and would not confirm if it was a murder-suicide.
“It’s not appropriate for me to speculate on any further matters,” he said.
“I can only say at this point in time we have no information to raise concern about wider public safety issues.
“This devastating tragedy will no doubt have a lasting impact on the families concerned, the whole community, and in particular, the local communities in our South West.”