"It is perhaps unsurprising that a nuclear bomb set off in the nation's capital would cause devastating and widespread damage.
Yet the simple conclusion did not put the government off, and they commissioned a report to assess the impact of a potential terror attack on Washington, D.C.
The results are far from comforting: the half-mile radius around the bomb would have a low chance of survival and most buildings - including that of the federal government - would be destroyed."
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Whether this is a real possibility I cannot say, but they have been reports of portable atomic devices which cannot be accounted for.