20 or 30,000 at least. How could you survive the collapse? Even if you weren't crushed, you couldn't breathe.
I took two of my sons to see Manhattan just a couple of weeks ago. We walked around the Towers and went to the Commodity Exchange. It could easily have happened then.
Who would do such a thing? Even for "70 virgins"?
Based upon news reports about the twin towers occupancy, it sounded to me like the death toll could go over 100,000. I am not trying to alarm anyone, but it sounded very very bad.