It's hard to say without knowing all of the details, which won't happen for a while due to the extreme secrecy surrounding the technical details of the bomb des

It's hard to say without knowing all of the details, which won't happen for a while due to the extreme secrecy surrounding the technical details of the bomb design among other things. However, the implication of the reports about the accident are that the collision with the ground was what caused most of the other safeguards to have failed, even though one of the safeguards appears to have failed during the breakup of the aircraft.