Weapons Watchdog Corrects Estimate of Nerve Agent Used in U.K. Attack Fifty to 100 milligrams — not grams — of nerve agent were used in the March 4 poisoning of Sergei Skripal in Salisbury, the Organization for the Prohibition of Chemical Weapons said. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Scientists Single Out a Suspect in Starfish Carnage: Warming OceansOverlooked No More: Forough Farrokhzad, Iranian Poet Who Broke Barriers of Sex and SocietyTo Slow U.S. Exit, Afghan Leader Offers Trump a Cost ReductionWill Brexit Make You Hangry?Iran Faces Worst Economic Challenge Since 1979 Revolution, Its President SaysVenezuela, Alibaba, Climate Change: Your Thursday Briefing