We know whose phone it was made from. "I feel tremendous sadness for my kids".
The police investigation is still ongoing to determine what had happened and the possible motive for the homicide.
Four children and three adults have been killed in Australia's first mass shooting since 1996.
West Australian Police Commissioner Chris Dawson said officers were called to a building in Osmington in the Margaret River region, 270 kilometres south of Perth, early Friday.
"We are devastated by this shocking event".
Commissioner Dawson said three firearms were recovered from the property, all of which were licensed to Peter Miles.
Katrina and her children were living with her parents on a farm in the remote town of Osmington in Western Australia.
Confirming suggestions of a murder-suicide, Mr Dawson added: "I wish to emphasise that police do not believe any other person is involved in these crimes".
"At 5.15am yesterday morning, police received a triple 0 emergency call from a male person", Commissioner Dawson said.
Aaron Cockman has seen firsthand the emotional anguish Peter Miles had gone through in recent years.
But there are other indications: police vehicles blocking roads; and the community center in nearby Margaret River offering counseling with television news cameras clustering outside.
Details have since emerged that Peter had recently been looking for work.
Their grandfather Peter Miles, 61, was found with what police are investigating as a self-inflicted gunshot wound. She owned the farm with Peter Miles but their involvement in the shooting has not been confirmed.
"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. Two firearms were found.
"It is tragic but life has to go on", neighbour Richard Dossor said.
Detectives are expected to spend several days at the property.
"I don't understand the suicide part of the story", said a close friend of Katrina's, who has asked not to be named. "There was just a lot of love in that family".
Margaret River-Augusta Shire president Pamela Townshend told The West Australian: "Everyone is totally shocked".
The bodies of two adults were found outside near a shed that had been converted into living quarters - while the children and a third adult were discovered inside.
While the Margaret River community is resoundingly resilient and pro-active in this arena, and vital support mechanisms for the family members directly affectedhave been swiftly put in place, it is now apparent that no one was able to reach in to the core of this family's private pain.
"I'm tremendously sad but I'll get through this", the father said, Reuters reported.
Despite the past, Cockman says he still loves Cynda.