According to what I understand, dirty bombs aren't something a terrorist would find useful compared to anything with a bang and lots of casualties. A dirty bomb would probably raise the cancer rate in a city years later, meaning no news, no terror.
They told Jose Padilla to work on blowing up gas lines rather than a dirty bomb.
The most serious concern by far is nuclear weapons or smallpox. This is right on in saying that a mushroom cloud over a US city would be perfect for them. It doesn't have to work that well to serve the 'terror' purpose.
It goes without saying that the most likely scenario of al Qaida getting a bomb is stealing one during dearmaments. Or buying it from a sympathizer. Like an Islamic theocracy, working furiously behind closed doors to enrich uranium for peaceful purposes. Pay no attention to the nuclear weapons researcher behind the curtain.
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