As Malaysian toxicologists reveal that the banned nerve agent VX was used in the airport assassination of Kim Jong-Nam, here are some key questions and answers about the deadly weapon of mass destruction. Code-named by the US scientists who mass produced it, VX is an organophosphate compound and one of the deadliest chemical agents ever manufactured. Stockpiled by the US in huge quantities during the Cold War, VX is perhaps 10 times as powerful as the Sarin toxin.



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