[ObfusGate]

I don't know a whole lot about this, but I believe it is difficult to set off a nuclear weapon. So, the accidentally blowing themselves up scenario is not likely. But the accidentally contaminating themseleves and their neighbors scenario would seem to be more likely.

[RoughDobermann]

For anyone interested in nuclear weapon technology, have a read of Tom Clancy's Sum of All Fears. That book goes into mind-numbing detail about nuclear weapon fabrication. The plot is about terrorists trying to blow up Denver with a thermonuclear weapon, which is vastly more difficult to fabricate than is an average fission weapon.