This is what a real fire looks like. This fire spread to all levels of this 32-storey building and raged for 18-20 hours (and didn't collapse into a dust heap). Compare this to the WTC towers in which fire raged for 1-1.5 hour on 6-8 storeys max and then collapsed into a dust heap.

http:// www. youtube (dot) com/watch?v=CUjaLQDJdMc