POLICE are calling for witnesses to a serious crash in Paulls Valley about 10.40am on Sunday, February 18.
The crash happened when a red 2009 model Subaru Forester collided with a silver and black 1994 Honda motorcycle on Mundaring Weir Road at the entry of The Dell carpark, about 2km east of Lockwood Road.
The rider of the motorcycle, a 51-year-old man from Wanneroo and the pillion passenger, a 43-year-old woman from Scarborough, both received serious injuries in the crash and were taken to Royal Perth Hospital.
The 22-year-old female driver of the Subaru was not injured.
Police would like to speak to the occupants of a white Mitsubishi Triton utility who saw the crash and stopped to assist at the scene.
Anyone who saw the crash or the Subaru or motorcycle prior to the crash, is asked to call Crime Stoppers on 1800 333 000 or report online.