Pinjarra Police are seeking witnesses to a crash on Pinjarra Road in Ravenswood on Friday.
About 3.10pm a Hyundai Trajet was travelling west on Pinjarra Road, Ravenswood in the outer lane.
Another vehicle was travelling in the inner lane and also heading in a westerly direction along Pinjarra Road.
This vehicle then began to move across towards the outer lane and into the path of the Hyundai.
This then caused the Hyundai to lose control and roll a number times.
It came to a rest in an upright position, around 15-20 metres west of Western Greenery at 1520 Pinjarra Road, Ravenswood.
The occupants of the Hyundai Trajet, including two children, were taken to Peel Health Campus where they were treated for shock.
The second vehicle drove away from the scene west along Pinjarra Road.
This vehicle was described as being a green/light green Hyundai Excel or Focus, around 10-15 years old and with a single male occupant.
Anyone who can assist in identifying this vehicle or who witnessed the crash is asked to call Crime Stoppers on 1800 333 000 or make a report online at www.crimestoperswa.com.au