THE VEHICLE WAS PARKED AND UNMOVED IN MY DRIVEWAY FOR SEVERAL DAYS. IT SUDDENLY BROKE OUT IN FLAMES (ORIGINATING IN THE ENGINE COMPARTMENT). THE FIRE GREW QUITE LARGE AND THE CAR EXPLODED (THE POLICE OFFICER'S WORD). SECURITY CAMERAS ON THE PROPERTY SHOW NO ONE IN THE AREA TO TAMPER WITH THE CAR. THIS WAS SPONTANEOUS COMBUSTION. A GOOGLE SEARCH OF "2009 BMW X3 FIRE" SHOWS MANY OTHER SIMILAR INCIDENTS.