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[–] BentAxel ago 

Because I do not know. What would it take to make concrete break up like it did? I remember there were some HUGE ass girders in the base of the towers.

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[–] Thats_not_my_dog 0 points 1 point (+1|-0) ago 

The entire building was made of huge ass girders. All the concrete was steel reinforced meaning there are webs of steel bars inside the concrete, it helps the concrete hold together when stressed.

I have no idea what would make concrete pulverize into dust, but it isn't from falling.