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:30 Dead and 200 Missing in Congo After Boat SinksIn Parliament Elections, Populists Seek to Break the E.U. From WithinEx-Official Levels New Corruption Accusations at Afghan Government30 Dead and 200 Missing in Congo After Boat SinksClash Between Protesters and Soldiers Turns Deadly in PakistanNigel Farage, Brexit’s Loudest Voice, Seizes Comeback Chance