The grieving father of four children who were killed in a family mass murder and suicide case that rocked Australia said Sunday their grandfather was to blame for what he called a planned shooting.
Aaron Cockman's children -- three boys and a girl aged eight to 13 -- were among the seven people found dead by police on a rural property in the small town of Osmington near the Margaret River wine region of Western Australia.
The bodies of their mother Katrina Miles, 35, and grandparents Peter and Cynda Miles were also found at the property.
Cockman, who told reporters in Margaret River he was estranged from Katrina, said "Peter didn't snap".
"I think he's thought this through. I think he's been thinking this through for a long time," Cockman added in his first public comments since the shootings.
Police have yet to confirm which family member was the shooter but said they were not searching for any suspects.
Three firearms licensed to Peter Miles were found by investigators.
Cockman said that after feeling "so much anger" during legal struggles over custody of his children, such feelings had vanished.
"I don't feel angry. I feel tremendous sadness for my kids. Angry will destroy you. I'm tremendously sad but I'll get through this."
Investigators have not revealed the motive behind the shootings, with Cockman only saying he previously enjoyed a close relationship with Katrina's parents.
"He (Peter) was like my best friend and I still love who he was, but his mental attitude... there are some people you just don't get on the wrong side of... and that's Peter and Cynda," Cockman added.
Mass shootings are rare in Australia, which has strict gun laws introduced after 35 people were killed in 1996 at Port Arthur in Tasmania.
The Osmington deaths are the worst mass shooting since then.
Western Australia state Premier Mark McGowan, who travelled to Margaret River on Sunday, said he did not think gun laws could be further tightened but he would await recommendations from a coronial inquiry into the shootings.
Liberals disagree with you, otherwise they wouldn't work overtime trying to make this happen.
They have to succeed first.
They just need events to come together in a most fortunate way that gets the ball rolling. Getting the AR-15 banned would be a big one, then they can work county by county and state by state, until they succeed across the country.
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