The daughter of Perth gunman Mark Bombara says she warned police three times about the “real and imminent threat” her father posed but was “ignored”.

Ariel Bombara spoke on Tuesday for the first time since the tragedy that claimed the lives of Jennifer Petelczyc, 59, and her daughter Gretl, 18, at their Floreat home on Friday.

Mark Bombara, 63, shot and killed the pair in an attack described as chilling and horrific.

He was reportedly searching for his wife when he went to the Petelczycs’ home and fatally shot them and then himself as police arrived at the property.

In a powerful statement, Ariel said she and her mother tried desperately to “raise the alarm” with police, fearing that their lives were at risk.

She also told police about her father’s large collection of guns, including a Glock handgun, which was unaccounted for.

“My understanding is this ultimately would be one of the weapons that my father used to take the lives of two innocent women,” she said.

Ariel Bombara says WA police ignored warnings from her and her mother. Photo: ABC News

Ariel said she made it clear to police that she and her mother believed their lives were in danger.

“We were ignored by five different male officers across three occasions of reporting,” she told ABC TV.

“By that point we felt completely helpless and I had to focus on getting mum to safety.”

Ariel said she had done everything she could to protect her mother.

“When my father couldn’t find us, he murdered her best friend and her best friend’s daughter,” she said.

Ariel and her mother fled their family home on March 28 in fear of their lives. She spoke to police three times between March 30 and April 2 to raise her concerns.

Bombara was known to police because his ex-wife had requested help when she and her daughter moved out of the house, following a series of family and domestic violence-related incidents.

Ariel and her mother had a police escort when they returned to the house on April 2 to collect belongings.

“This was the third occasion we warned police about my father’s guns. One officer said, ‘oh don’t worry, we know all about the guns’, and when he called for backup, he warned his fellow officers to wear bulletproof vests,” Ariel said.

Bombara owned 11 guns on a recreational shooter’s permit and two pistols on a collector’s licence. One of them was used to kill the Petelczycs.

Ariel Bombara’s full statement.

Police are not officially treating the shootings as domestic violence because there was no family relationship between Bombara and the murdered women. But Western Australian Premier Roger Cook said the chilling and sickening crime was motivated by domestic violence.

On Tuesday, Ariel agreed.

“What my father did was an act of domestic violence. My mother and I made clear that lives were at risk, and we were repeatedly ignored. Repeatedly failed. Those failures have cost the lives of two incredible women,” she said.

“My father should always be considered accountable for his actions. They were his and his alone; however, there are authorities who should have helped us to stop him, and they failed.

“I want answers.”

Police were called to the Petelczycs’ home in Perth’s affluent western suburbs about 4.30pm on Friday after reports of gunshots.

Jennifer Petelczyc died at the scene. Officers rushed 18-year-old Gretl to Royal Perth Hospital, where she died on Saturday.

Mother and daughter are survived by Petelczyc’s other daughter, who is Gretl’s older sister.

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-with AAP