[No Blue States]

It seems like a dirty bomb is too complicated (and heavy)compared to anthrax and other chemical and biological weapons that are easier to secure, transport, and disperse.
That speculation on my part, or wishful thinking.

[Doctor Stochastic]

It's pretty hard to carry 180lbs of stuff in a briefcase. Not to mention setting off every radiation detector around.

A hoax seems more likely.

[hispanarepublicana]

I think "the next big thing" terrorism-wise will be the introduction of foot & mouth disease into our livestock or some deadly mycotoxin on our grain supplies. The quickest way to create chaos anywhere is to limit or threaten food supply. It's hard to believe, because food is so accessible in the U.S. But, it was a food crisis that spurred the French Revolution (that's why they spend thousands more per acre on food subsidies than we do). I once had a tour of Hunt's Point (food terminal and distribution point) in New York, and I was stunned to find that Manhattan, were it isolated and cut off from outside food supplies on any day, would have exactly 2 days' food supply before chaos would break out.