"The Last Jihad" by Joel Rosenberg opens with an assault on the U.S. President's entourage at Denver International Airport. The attacking aircraft is a private jet inbound from Canada. It's not a big stretch to imagine a private jet in Canada as a platform to make a run on any major city in the northeast or midwest. Smuggling the weapon into Canada via ship or barge isn't that tough either.
Re- nukes
On the information posted yesterday- the "secret plan" page- they were saying that they had 7 nukes. 5 were from the former Soviet Union and 3 were from our good ally- Pakistan.
Sean said last winter that they actually had considerably more nukes- some 35 or so, if I recall correctly.
(That was when the NEST teams were allegedly searching for the nukes.)
They are bragging that they brought them in - via cargo ships- prior to 9-11, and have them well-hidden.
I wonder where one could hide a refrigerator size nuke and get away with it?
They are also bragging that they have several planes hidden in rural areas- possibly in barns/warehouses.
In my summary above, please note on 5/27/04 at the Port of Halifax a cargo container was stolen - contents unknown. This is exactly the problem you reference.