ychtt,what I say is that half a dozen men with handtools could have replaced the central column boltings at a lower level with substitute substandard boltings,almost silently.
This could collapse the central columns as shown on video everywhere.
Explosions would be good but not absolutely necessary as bolt failure would occur with the slightest of movements of the building,(bolt shearing).
I'm not saying this is what caused any collapses of buildings of course.
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