Google 'Vincent Dunn.' This is a Fire Chief's explanation of why the towers fell the way they did...No political motives. Just a man with an understanding of fire, and it's interesting to point out like that link does, that concrete played a role in the collapse, not just steel.Anyways..I don't see how Rudy answered it wrong. He said that he was informed they COULD collapse, that could've meant before the time he was talking about, that he didn't know they would collapse.