All seven were found last Friday in a shed on a rural property in the small town of Osmington near the Margaret River wine region in Western Australia, police said. Australian police confirmed the use of guns in what could be the country's worst mass shooting in 22 years.
"Police are now responding to what I can only describe as a horrific incident", he said. Two firearms were found on the property, but it is not known who began the massacre.
The two other bodies, found outside, were reported to be Miles' parents, Cynda and Peter Miles.
The police commissioner said homicide detectives were helping local police with the investigation, supported by specialist units and a chaplain.
"The hairs on my arms where standing up all day yesterday, it really grabbed me because of the kids involved", he said. Western Australia state Police Commissioner Chris Dawson described the incident as a "significant tragedy". It wasn't until I saw the police that I thought, 'Hang on a minute.' (The shots) were separated out; there was quite a long gap between them.
Asked if the two-minute emergency call made from the property at 5.15am on Friday was the reason police were so quickly able to rule out a gunman was on the loose, Mr Dawson said: "That's not for me to expand on now".
That incident was so shocking it ushered in tight gun control laws that have been held up as a global standard for preventing gun violence.
A neighbor, Meg Janes, told Perth Now she heard the gunshots and assumed someone was shooting kangaroos but said in hindsight it was likely something far more sinister.
The National Agreement on Firearms all but prohibited automatic and semiautomatic assault rifles, stiffened licensing and ownership rules, and instituted a temporary gun buyback program that took some 650,000 assault weapons (about one-sixth of the national stock) out of public circulation. Katrina is believed to have home-schooled her four children, although there were reports that they were students at Margaret River Primary School as well.
'Police are now responding to what I can only describe as an horrific incident in Osmington, 20km north-east of Margaret River.
WA Premier Mark McGowan has offered his sympathies to the family of the victims, describing the incident as "appalling, bad and terrible".
The country's gun ban has been hailed by many gun-control activists in the United States and around the world as a template for preventing mass shootings and gun violence.
"Every member of the South West Home Schooling Network has been touched by the Miles family and we are heartbroken to lose someone that had such an incredible impact on the community".