The driver of this car was killed in a smash in Thornlie overnight. Photo: @emwhitey
Police believe a Thornlie man who was killed on Friday when his car smashed through a brick wall may have been racing a friend.
The 19-year-old Thornlie man, who died at the scene on the corner of Southdown Place and Spencer Road, was driving a Holden Commodore and apparently racing the driver of a Nissan 300ZH hatch.
Police were at a traffic stop at 11.50pm when they heard what appeared to be two vehicles travelling at speed.
The destruction caused by the Thornlie crash. Photo: @emwhitey
Police officers saw one of the vehicles lose control and crash into a brick wall, before ending up in the back yard of a house and catching fire.
Neighbour Coral Farmer told Radio 6PR's Steve Mills that she was woken up by an "almighty crash".
"All I could see was headlights and smoke and the smell was incredible, it wasn't nice," she said.
Ms Farmer said the crash took place on a long, straight stretch of road that she said was treated like a speedway at night.
"The situation could have been much worse because my neighbour's bedroom is at the back of the house," she said.
A crane was brought in on Friday morning to remove the Commodore.
Police are still examining the scene and have asked the public to avoid the area during the morning peak period.
Investigators are calling for anyone that may be able to offer information that can help determine the cause of the crash to contact Crime Stoppers on 1800 333 000.
Ms Farmer urged drivers to slow down on Spencer Road.
"It has a speed limit of 60km/h for a reason," she said.
Detective Senior Sergeant Brian Hunter said there was information suggesting the two cars may have been racing, and confirmed police had interviewed the driver of the Nissan, who he said was a friend of the deceased man.
"We're exploring that possibility at the moment," he said.
"We've spoken to the driver of another vehicle that was there at the time, we've interviewed him and he's given us a certain amount of information.
"We haven't at this stage made a decision to charge anyone.
"We believe the two drivers are friends...he's obviously upset about this."
He added the deceased man did not have a current WA driver's licence, but may have had an overseas licence.