Halló all, Bill I am sorry to hear about your loss and i see In this thread that some of us are not ready to answear or ask this questions. But the building had big iron-bound In the middle, but when a plaine hits the building full of gas the gas goes down to the middle of the WTC and the heat´s of the fire melds down the Iron so it´s fell into it self and we all know what happent. I hope you understand this. May god be with you all. I hope that I did not hurt anyone by this. All the best Skarpi Iceland.