The investigation into the April 29 crash of a National Air Cargo Boeing 747-400 at Bagram Air Base in Afghanistan is being aided by a video caught by a witness in a nearby vehicle that shows the aircraft in a steep climb shortly after takeoff, followed by wing rolling and an eventual stall before the aircraft struck the ground.

Seven people aboard the Boeing died in the crash. Early speculation about accident causes is focused on whether one or more of the heavy vehicles aboard might have broken free during rotation and rolled toward the tail, moving the CG aft to the point that the aircraft was uncontrollable.