It's the kerosene that burnt in the WTCs, the high temperatures weakened the steel construction and made concrete brittle. Not much conspiracy here, just physics.
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Kerosene burning on the top floor of a building doesnt cause the lower floor structure to melt in 11 seconds. We know this because of common sense and also we have countless buildings hit with missles that burn for days and the structure doesnt collapse, should i present videos?
Heres an interview of secondary explosions.