A husband and wife have died after the car they were travelling in was hit by a vehicle, earlier involved in a high-speed chase with police.
Police aborted its chase of a Ford Falcon, driven by a 16-year-old boy, alleging the teenager was driving erratically along Warwick Road, Warwick at about 7.30pm.
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Two dead, hit by car fleeing police
Two innocent people have been killed and a third seriously injured after they hit a car that had been involved in a police pursuit. (Vision courtesy ABC News 24)
The Ford then sped off and collided with a Nissan Pulsar at the intersection of Warwick and Ballatine Roads.
The two passengers inside the Nissan - a 66-year-old man and 60-year-woman - died due to the injuries suffered in the crash.
The 25-year-old male driver of the Nissan, who is the son of the couple who died, remains in Royal Perth Hospital with life-threatening injuries.
The teenage driver of the Ford, fled the scene but was later arrested by police.
An 18-year-old woman, who was a passenger in the Ford, was taken to Royal Perth Hospital with minor injuries.
Police deputy commissioner of operations Stephen Brown told reporters on Sunday morning the 16-year-old driver and the 18-year-old passenger of the Ford were in custody.
He said the pair had not been charged at this stage.
Mr Brown said there would be a "rigorous and comprehensive investigation" into why officers pursued the Ford.
"The nature of the pursuit, what gave rise to it, the duration of it and what happened there after," he said.
"What I do know is our officers in that vehicle were appropriately trained and the class of vehicle they were travelling in was right within our policy settings.
"We've got limited facts... we haven't been able to interview the 16-year-old driver that evaded police nor the passenger, but the police officers have been interviewed... but all those facts need to be brought together."
Mr Brown said the officers involved in the chase were "clearly distressed" after attending the crash scene.
"As you would imagine anybody, despite their training, going about your duty in good faith... to be involved in such a situation has massive impact on individual officers," he said.
Anyone who witnessed the crash, or who saw the white Ford Falcon or red Nissan Pulsar prior to the crash, is asked to call Crime Stoppers on 1800 333 000 or report it online at www.crimestopperswa.com.au.