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What if Al Queda had targeted two nuclear reactors with hijacked jets, along lines that were actually proposed to Osama bin Laden and which he rejected? Assume that the planes manage to break the protective shells (as is thought likely at speed) and that there are massive radiation leaks as a result.
What would the consequences have been?
(Note: Bin Laden rejected the proposals because of potential "unforeseen consequences" - can you do better?)