Two teenagers have been treated for injuries after allegedly threatening an Albany grandmother, stealing her car, leading police on a rural pursuit and crashing the car 155km away in Kojonup.
A 15-year-old East Victoria Park boy has a broken collar bone and knee and a Bentley boy, 14, has suspected internal injuries.
A police spokeswoman said the pair approached a 54-year-old woman in Albany as she waited in her car for her granddaughter at a North Road Shopping Centre in Yakamia, Albany, around 8.25pm last night.
The teens allegedly threatened the woman with a knife and demanded her car, a Mitsubishi Magna sedan.
She got out of the car and the two males got into the car and drove away towards Albany Highway.
"Shortly after, police attempted to stop the vehicle on Albany Highway, however it failed to stop and accelerated away," the police spokeswoman said.
"A pursuit commenced, however police lost sight of the vehicle.
"At around 9.30pm, Kojonup police observed the vehicle travelling into the townsite.
"They lost sight of the vehicle but shortly after, located it crashed into a tree after losing control through roadworks."
The car was on fire, but police were able to remove the pair.
A 15-year-old East Victoria Park boy, who is believed to be the driver of the stolen vehicle, received a broken collar bone and knee and was conveyed to Katanning Hospital.
A 14-year-old boy of Bentley was transferred to Royal Perth Hospital with suspected internal injuries.