I think it would be bst to wait until there's more information. Today has been very hectical and I believe it is important to process the information and wait until we've heard some numbers before we start pointing fingers. I'll come back here later.
Until then, a theory:
It's all a hoax so that Bush has an excuse to bomb palestina and afghanistan. All the networks have been bribed and people were hired to create a simulation of the collapse of the WTC.
NOT
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The last arrow of Legolas kindled in the air as it flew,
and plunged burning into the heart of a great wolf-chieftain.
All the others fled. -J.R.R. Tolkien, The Lord of the Rings
This picture has nothing to do with the other part of my sig. It's just cool.