WHILE VEHICLE WAS MOVING IN REVERSE AT AN UNKNOWN SPEED ENGINE SUDDENLY ACCELERATED, AND CRASHED INTO A PARKED BUS. VEHICLE ACCELERATED TO AN UNKNOWN SPEED, AND TRAVELED APPROXIMATELY 15 FEET BEFORE THE CRASH. VEHICLE HAS NOT BEEN EXAMINED BY A MECHANIC TO DETERMINE CAUSE OF THE PROBLEM. CONSUMER EXPERIENCED BACK PAINS SINCE THIS INCIDENT. PLEASE PROVIDE ANY ADDITIONAL INFORMATION / DOCUMENTATION.*AK