Operatives linked to Iran tried to kill foreign diplomats, including Israelis and Americans, in at least seven countries over 13 months, the Washington Post reported. New evidence uncovered by investigators in four countries linked the assassination attempts to either Iran-backed Hezbollah militants or operatives based inside Iran, the Post reported Monday, citing U.S. and Middle Eastern security officials. The officials reportedly said that the assassination attempts stopped in early spring, when Iran began to take a softer tone with the West. Shortly after, Iranian officials formally accepted a proposal to resume negotiations with six world powers on proposals to limit...