So, the correct conclusion was the one the Russians brushed off when it was first identified over a week ago? Nice job, KGB, or whatever you call yourself now.
Apologies!!!
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Until an analyst with access to the wreckage says otherwise, I'm going to stick with my initial proposed placement of that 1 Kg bomb:
1: Above the passenger deck (in the cabin volume; not in the hold)
2. In -- or just forward of -- the aft latrine.
3. Severed or drastically weakened the tail section, and almost instantly, that thing went from a flying aircraft to a porpoising, tumbling, falling, lethal pile of disintegrating junk.
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My heart goes out to those poor people who had to experience that prolonged, violent, painful, deadly ride!