Comment Re:The explanation is simple (Score 1) 245
It was an unintended consequence of the top secret "suitcase nukes" held in the planes that caused the towers to collapse.
(roughly equivalent to 2KTn's of tnt, you can see that on the seismographs just before the buildings collapse)
These cool little bastards release their entire payload as electrical energy (causing steal supports to pretty much vapourise) and have very low residual radiation (low levels of alpha particles, no harmfull to anyone except those who come in direct contact with the debris)