Four people, including two children, have been seriously injured in a crash near Williams.
Police said a beige Mitsubishi Pajero was travelling north-east on Pinjarra-Williams Road when it crashed into a tree about 9:37am.
The injuries of those inside the car were so severe St John Ambulance sent two of the state’s only RAC Rescue helicopters too the scene.
A passenger, a 42-year-old, woman, was the first to be airlifted to Royal Perth Hospital with the driver, a 44-year-old, man, following closely behind in the second aircraft.
A 10-year-old girl and eight-year-old boy were taken by St John Ambulance to Narrogin Hospital with serious injuries.
They’re expected to be flown to Perth Children’s Hospital by the Royal Flying Doctors Service.
Investigators are urging anyone with information, dash cam vision or witnesses the crash to contact Crime Stoppers on 1800 333 000 or make a report online via crimestopperswa.com.au