The Sunni-Shiite Tension Behind the Iran-Saudi Arabia Fallout Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Iranians hold portraits of Shiite clreric Nimr al-Nimr during a protest in Tehran. ( Atta Kenare / Getty ) Produced by Amber Hall Produced by PRI and WNYC