WHILE DRIVING VEHICLE APPROX. 70 MPH LEFT REAR TIRE TREAD HAD SEPARATED FROM WHICH CAUSED AN ACCIDENT. TIRE WAS STILL INFLATED AFTER THE ACCIDENT WITH NO TREAD. TWO OUT OF THE THREE PASSENGERS SUSTAINED SERIOUS INJURIES. TIRE WAS A FIRESTONE ATX P235/75R15, AND APPROXIMATE TIRE MILEAGE WAS 5OOOO. TIRE WAS ORIGINAL TIRES OF WHEN VEHICLE WAS PURCHASED. VEHICLE IS A 96 FORD TRUCK EXPLORER. *AK