What they found was the bodies of two adults outside, and another adult and four children inside the converted shed.
Aaron Cockman's former partner Katrina Miles, their 13-year-old daughter Taye and sons Rylan, 12, Arye, 10, and Kadyn, 8 were all found dead at a private property in Osmington on Friday (local time).
"I can only describe [it] as an horrific incident", Police Commissioner Chris Dawson said at a news conference, according to the Australian Broadcasting Corporation. "We are stunned and still trying to understand how this could happen", they said in a statement.
Authorities have not publicly identified the deceased, but a family friend told the Australian Broadcasting Corp. that the seven victims were Peter and Cynda Miles, their daughter, Katrina, and Katrina's four children.
Police said they went to the scene after receiving a call from a man connected to the property at 5:15 am, but did not give further details.
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However, on Saturday, Dawson said one woman was found inside the main house.
"I still love who Peter was", he said. In 2014, a farmer shot his wife and three children before killing himself. Police wouldn't say who made the call.
Libby Mettam, a local parliamentarian, said the deaths had sent "significant shockwaves" through the town and the community was hurting.
The property is owned by Cynda Miles and her husband Peter.
Flowers have been left outside the Osmington property where the bodies of seven people were found. He did not divulge any more information other than that two firearms have been located.
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Cynda and Peter were well known in the Margaret River area - she for her extensive community involvement and he for his longstanding and successful farm maintenance business.
"He's understandably grieving, and we're providing as much support as we can", the ABC reported Dawson saying.
"We have some of the tightest gun laws in the world and I think we're an example to the rest of the world that you need to have very careful and strict controls when it comes to gun ownership and gun usage", Mr McGowan replied.
Mr Garnett said he was feeling helpless and at a loss on hearing the news, so he cooked sausages and brought them with bread and sauce to the police officers manning the roadblock, which will likely remain in place on his street for days to come. "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".
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