IMHO, this article should read:
Entire world on terror alert for AQ nuke attack.
Whats to say that these animals haven't smuggled Nuke material into our country?
Thats the BIG question isn't it. But then the first question that needs to be answered is do they have one to begin with? That is problematical, although there has been an abundance of rumors that the KGB, Russian Mafia or Chechen rebels (take your pick of the source) have stolen them and sold them to AQ. This is an old story with no hard facts other than rumors. The second question is why haven't AQ used them against Israel or the Saudi monarchy? Both of these targets were higher in their priority prior to 9/11. Finally, if they have one, it probably wouldn't be too hard to smuggle it in some how. However, what are they waiting for? Our internal security is plenty porous enough to allow a cargo truck with a 10kt device to go just about any where in the country unrestricted.
Mossad- at least we intercepted their "Navy"!