'Horrific crime scene': Three people killed at suburban Perth home

Three people have been killed as a result of an “terrible tragedy” at a suburban Perth home, which one senior officer described as the “most horrific crime scene” he had ever attended.

A 19-year-old man is in custody after being arrested at Ellenbrook early on Sunday.

WA Police said a man and woman were found dead inside a property and a second woman was found critically injured in the backyard, but died en route to hospital.

The trio and the young man in custody were all residents of the property, however police have not yet revealed the nature of their relationship.

Police have not released the ages of the victims but they are believed to be a mother and two children.

Homicide detectives and specialist forensic police investigating the scene of the triple fatality at a property in Ellenbrook. Source: 7 News

Police told media on Sunday homicide detectives and specialist forensic police were investigating the “very complex and horrific” crime.

“It will take us some time to process that crime scene, and that could be days,” Assistant Commissioner Paul Steel said.

“A senior homicide squad investigating officer said to me today it is potentially the most horrific crime scene he has ever been called to.”

Describing the homicide as a “terrible tragedy”, Assistant Commissioner Steel added: “The crime will send shockwaves trough the Western Australian community.”

Police say they found two dead inside the property and another in the backyard with critical injuries, who later died. Source: AAP, file

Police said in a statement they were called to a convenience store on The Broadway in Ellenbrook about 1.30am on Sunday after a man showed up and requested police.

Officers attended the store before heading to a nearby residential address in Ellenbrook. Both locations are currently crime scenes.

A man who lives in a neighbouring street earlier told The West Australian he was woken by screaming and yelling about 1am.

“It was real loud screaming and yelling, it sounded pretty heavy,” Matthew Schreck said.

Homicide Squad detectives, along with forensic officers, remain at the scene today.

Anybody with information should call Crime Stoppers on 1800 333 000 or make a report online.