'Inadequate': Police Minister admits failings after shocking double murder

Mr Papalia's comments come after the daughter of the Perth gunman Mark Bombara said she repeatedly raised concerns to police in the lead up to the shooting - but nothing was done.

Police were called to a home in the upmarket suburb of Floreat on May 25 after reports of gunshots.

The mother and daughter were both fatally shot before Mark Bombara turned the gun on himself.

Bombara was searching for his ex-wife who had previously stayed at the house.

Mr Papalia said in his personal view "there is a need to lower threshold when there is an acrimonious breakup and it is known guns are involved, we need to move very quickly to remove those guns".

"It is inadequate, I've acknowledged that," he said.

In a lengthy statement released to the media, Ariel Bombara said she contacted police on three separate occasions between March 30 and April 2 to warn them of the "real and imminent threat" her father posed.

"I specifically mentioned there was a Glock handgun that was unaccounted for," she said.

Ms Bombara said she also asked police if she and her mother could take out a temporary protection order but was told 'No'.

"We were ignored by five different male officers across three occasions of reporting," she said.

"By that point, we felt completely helpless and I had to focus on getting Mum to safety.

"I did everything to protect my mother and when my father couldn't find us he murdered her best friend and her best friend's daughter."

The young woman said it was her "unwavering belief" that her father would have murdered people even without her guns.

She said while her father should be held accountable for his actions as "they were his and his alone" there were authorities who should have stopped him.

Bombara owned 11 guns under a recreational shooter's permit and two pistols under a collector's licence, one of which was used to kill Jennifer and Gretl.

Police Minister Paul Papalia said WA's proposed laws would be the toughest in the country after the murders; that they would have prevented Bombara from obtaining the collector's licence; and that he would have been limited to owning five weapons.

He would also have been forced to undergo a health check with a mental health component.

"This individual, sadly, was a fit and proper person, right up until the time he committed that act and he was a law-abiding firearms owner right up until he wasn't," he said on Monday.

"Under the current law that's what happens and that's why we want to make the laws tougher."