Major crash investigators are calling for witnesses to an incident which has left a 15-year-old girl with serious head injuries.
Around 1:25am this morning, a white Holden Commodore was travelling along Padbury Road in Pinjarra when a girl fell from the top of the boot area, hitting her head on the roadway.
The 15-year-old was then conveyed by ambulance to the Peel Health Campus before being transferred to Royal Perth Hospital for treatment of a serious head injury.
The 17-year-old female driver is assisting police with their investigation.
Authorities are urging anyone who saw the incident, or the Holden Commodore prior to the crash, to call Crime Stopper on 1800 333 000 or report information online at www.crimestopperswa.com.au.