While people enjoy speculating about bulkhead rupture, bomb, etc. It really puzzles me what were the forces that ripped off horizontal and vertical stabilizers along with APU section and rear part of fuelage.
If the tail cone and empennage departed the fuselage intact, it's likely the effective 'flat plate' of the bulkhead facing the airstream would have caused immediate, violent tumbling, with consequent violent reversals of wind loads on the empennage as various flat surfaces rotated into and out of the relative wind.
Think of it in terms of twisting the leg off a roast chicken.