Major Crash are investigating a head-on collision near Capel on Saturday, November 16, which saw a 12-year-old tourist airlifted to Perth with serious head injuries.
About 8.35am, a blue Kia Rio travelling east along Ludlow Road North and a white Toyota Hilux travelling west collided near the intersection of Peppermint Grove Road in Stirling Estate.
A 12-year-old girl, who was a front seat passenger in the Kia Rio, received serious head injuries and was airlifted to the Perth Children's Hospital.
The 50-year-old female driver and a 13-year-old female passenger sustained non-life-threatening injuries and were conveyed to Bunbury Hospital for treatment.
It is understood the occupants are visiting Australia from the United States.
The 57-year-old male driver of the Toyota Hilux and a 55-year-old male passenger, both from Busselton, received minor injuries.
Major Crash investigators have called on anyone who may have witnessed the crash, or the Kia Rio or Toyota Hilux travelling in the area prior to the crash, to come forward.
Anyone with dash-cam vision of the area around the time of the crash is asked to call Crime Stoppers on 1800 333 000 or report it via www.crimestopperswa.com.au