[Ken H]

That's a tough call on whether to go public with such a warning. I think a lot depends on how high their confidence is in the threat.

If they thought the threat was real, then I would come down on the side of full disclosure and let each New Yorker decide what to do. My guess is that most would have stayed and gone about their business.

I'd like to know if any government officials left NYC or stayed away from NYC as a result of this information.

[altura]

Good question!

It would be interesting to know if anyone left, and, if so, who?

Maybe someone who considered himself/herself crucial to our country like Daschle or H. Clinton.