VEHICLE WAS PARKED IN DRIVEWAY, WAS IN "PARK" GEAR AND HAD BEEN RUNNING FOR APPROXIMATELY 20 MINUTES. VEHICLE WAS TURNED OFF AND KEYS WERE REMOVED FROM IGNITION WHEN VEHICLE SUDDENLY STARTED TO ROLL BACKWARDS. REPORTEDLY, VEHICLE WAS RESTARTED AND BRAKING WAS ATTEMPTED BUT VEHICLE WOULD NOT STOP. VEHICLE ROLLED INTO TREE/FENCE AND DAMAGED PASSENGER DOOR, THAT HAD BEEN LEFT OPEN IN THE HASTE OF THE INCIDENT, AND THE REAR BUMPER. DAMAGE ESTIMATES AT 4K.