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:Syrian Soldier Is Guilty of War Crime, a First in the 6-Year ConflictIranian Chess Player, Shunned for Refusing to Wear Hijab, Will Play in U.S.News Analysis: After Threat of War, Iraq and Kurds Lower the TemperatureEgypt Expands Crackdown on Gay and Transgender PeopleLas Vegas, Puerto Rico, Tom Petty: Your Tuesday Evening BriefingCatalans Who Did Not Vote (More Than Half) Ask: What Now?