DT: THE CONTACT STATED WHEN THE VEHICLE WAS REAR ENDED THE BACKS OF BOTH FRONT SEATS FAILED. BOTH SEATS FELL, CAUSING INJURIES TO BOTH THE DRIVER AND PASSENGER. THE SEAT BELTS WERE USED AT THE TIME OF THE ACCIDENT. THE DRIVER WAS THROWN INTO THE BACK SEAT WHICH CAUSED DAMAGE TO THE BACK SEAT. THE PASSENGER HIT THE SUN ROOF AND SIDE WINDOW. THE SPEED AT WHICH THE VEHICLE WAS HIT WAS UNKNOWN. THE VEHICLE WAS TOTALED, AND HAS NOT BEEN INSPECTED. A POLICE REPORT WAS TAKEN AT THE SCENE.*AK