VAN WAS IN PARK AND DRIVER STANDING ALONGSIDE VEHICLE WHEN SHE TURNED THE IGNITION OFF. AS SOON AS THE ENGINE WAS OFF THE VAN PROCEEDED TO ROLL BACKWARDS MAKING A CLICKING NOISE. DRIVER TRYED TO ENTER THE VAN TO STOP IT AND WAS DRUG BY THE VAN ON THE CONCRETE. THE VAN PROCEEDED UNTIL HITTING THE BACK OF A CONCRETE BLOCK BUILDING.