Three U.S. diplomats stepped up pressure against the Syrian government on Friday by accusing it of continuing to use chemical arms against its opponents in the country’s four-year civil war. The American ambassador to The Hague-based Organization for the Prohibition of Chemical Weapons, Robert Mikulak, cited a “steady stream” of accounts that the government is using chlorine as a chemical weapon, as recently as this month. Deputy Secretary of State Antony Blinken told reporters that accounts by people in Syria over such chemical attacks are “strong and credible.” And Samantha Power, the U.S. ambassador to the United Nations, said evidence makes clear that Syria is killing people by dropping chlorine-filled barrels from helicopters […]