Police have confirmed two men died during the severe storms that hit Perth's southern suburbs this morning.
The two 25-year-old Beaconsfield men - who both had pre-existing medical conditions - were found at 7.30am today.
The two men relied on medical equipment which may have stopped working when their house lost power.
Police said they would investigate the deaths, which were not being treated as suspicious, and prepare a report for the coroner.
Inquiries will relate to the electronic medical equipment.
More than 15,000 homes were without power following the wild weather that also brought down trees and damaged houses.
Police are not treating the death as suspicious and a report will be prepared for the coroner.
Earlier today the Bureau of Meteorology confirmed the damage in Perth's southern suburbs this morning was caused by a tornado.
Power lines were down in Booragoon, Myaree and Hilton as more than 80 State Emergency Service volunteers responded to 75 calls for help since 5am.
A bureau spokeswoman said a wind engineer had inspected damage in Hilton and concluded a tornado had hit the suburb, with winds well exceeding 125km/h.
On Ethelwyn Street in Hilton, residents told of hearing a loud bang before they lost power and strong winds ripped their properties apart.
Several properties are without roofs and fences, trees and snapped power poles are strewn over the road.
Stephen Howarth had the windows of his home smashed in the storm.
"There was an almighty bang and I knew what it was straight away. I couldn't get to the doors and windows to open then in time before they exploded outwards with the pressure," he said.
"We've found things in the garden that were in the house."
Mr Howarth said sheet metal from a nearby factory was blown on to his car, damaging it.
The winds, he said, were so powerful that a boat parked in a neighbour's driveway was blown over and a minibus was "picked up and moved".
He said the street's residents were baffled how homes in neighbouring streets had been untouched.
"It's only on this street, we've all been hit," he said.
Noel Nicholas told of how he bunkered down on the first floor of his property, on the corner of Ethelwyn and Clarke Streets.
The roof of his home has disappeared, leaving only two bedrooms covered.
The windows of the home have also been smashed and fences and the garage destroyed.
"There was an almighty explosion and that's when we knew we were in trouble," he said.
Mr Nicholas was emotional when he told of how the family home was now uninhabitable. He has lived in the property for 45 years.
Neighbours rallied around the street this morning, bringing cups of tea and coffee to those now unable to go inside their homes and helping sweep driveways of debris.
Some stood on balconies surveying the damage while SES volunteers worked to remove trees from the roads.
"I'm just devastated and I just can't believe how this happened so quickly. Just seconds and it all was gone," Mr Nicholas said.
Several trees fell on to the road in Melville but have been cleared.
Power lines are also down in O’Connor on Murphy Street.
Western Power says some homes in surrounding suburbs, including Melville, are without power.
Information on the utility’s website says power is expected to be restored by 8.30am.
In Carbunup River, in the South West, a car has struck a tree which had fallen across Bussell Highway.
Main Roads has also warned of a crash westbound on Canning Highway, near South Terrace, in Como, where a crash is blocking the middle of the intersection.
Police are at the scene directing traffic.
A Western Power spokesman confirmed 11,000 homes were without power after strong winds swept through Perth’s southern suburbs.
The most affected areas, he said, were Willetton, Hilton, O’Connor, Booragoon and Beaconsfield.
Traffic lights are out at the corner of Canning Highway and South Terrace in Como.
Several trees and branches are down around the Thornlie Avenue area in Thornlie.
If you see a fallen power line, Make the Safe call to Western Power on 13 13 51.