Up to five people, including children, have been found dead at a home in Perth.
A man aged in his 20s handed himself into a regional police station on Sunday morning which led officers to a home on Coode Street in Bedford where the bodies were found.
Assistant Commissioner Metropolitan Region Paul Steel told reporters on Sunday police arrived at the home about 12pm (local time) to find women and children among the dead.
"Police have located the bodies of a number of deceased people including women and children. Whilst the scene is yet to be forensically examined it is believed up to five deceased are located at that scene," he said.
"It is a tragic thing when incidents like this occur. It does send a ripple through the community of Western Australia."
He could not confirm the ages, genders and relationship of the deceased.
Mr Steel said the forensic police and the homicide undertaking a "meticulous" investigation of the crime scene which "could take a number of days".
It is yet to be determined how long the bodies had been there, he said.
The man is in custody and being interviewed by police.