CAR WAS PARKED ON A VERY MINOR GRADE, TRANSMISSION WAS IN PARK, KEYS REMOVED AND THE CAR WAS LOCKED. THE CAR THEN BEGIN ROLLING BACKWARDS UNTIL IT WAS STOPPED BY ANOTHER CAR IN THE PARKING LOT. THIS OCCURRED IN A CHURCH PARKING LOT AND SEVERAL PEOPLE OBSERVED AFTERWARDS THAT THE CAR WAS INDEED LOCKED AND THE TRANSMISSION WAS IN PARK. NO ONE WAS IN EITHER VEHICLE. I DON'T HAVE ANY PHOTOS OR A POLICE REPORT, ONLY WITNESSES.