Steel does not have to melt to become weak. one can easily bend a nail that is heated only to dull red. You can easily get the nail this hot with a simple air-propane torch, (Bernz-o-matic) (?) no oxygen or pressure needed.

I heard a reporter in real time describing the fall of the second tower on my car radio. It was one of the most terrible experiences of in my memory. I don't beleive for a minute that it could have been faked.
It agreed with the tv footage shown later.

MD