2000 Volvo 700

WHILE TRAVELING AT A SPEED OF 60 MPH THE DRIVERS SIDE DOOR GLASS SUDDENLY AND VIOLENTLY IMPLODED COMPLETELY INTO THE CAB OF THE VEHICLE. THE ENTIRE WINDOW SHATTERED AND BLEW ALL TO THE INSIDE OF THE CAB. AT NO TIME DID I SEE ANY ROAD DEBRIS COME UP AT THE WINDOW OR OFF THE FRONT OF THE VEHICLE. NO VEHICLES WERE ONCOMING OR HAD PASSED ME. I RADIOED TO THE VEHICLE DIRECTLY BEHIND ME AND THEY DID NOT SEE ANY OBJECTS FLY UP OR AT THE WINDOW. THERE WAS NO ONE IN SIGHT IN THE EMPTY FIELDS ALONG SIDE THE HIGHWAY CONSIDERING IT MIGHT HAVE BEEN A GUNSHOT. CLEANING UP THE GLASS I FOUND NO DEBRIS INSIDE THE VEHICLE, THINKING IT SHOULD HAVE COME IN WITH THE FORCE AND DIRECTION OF ALL THE GLASS. NOTHING. NO ROCKS, BIRD OR SLUG. THE WEATHER WAS SUNNY AND THE OUTSIDE TEMPERATURE WAS 60 DEGREES. IT WAS APPROXIMATELY 11:00AM. THE ROAD WAS SMOOTH. ALL OF THE VEHICLES CAB WINDOWS WERE CLOSED.*AK