5 facts about Sunnis and Shiites that help make sense of the Saudi-Iran crisis

The Washington Post: The execution of Shiite cleric Nimr Baqr al-Nimr by Saudi Arabia has sparked a furor in the Middle East along sectarian lines. In Iran, the regional Shiite superpower, the Saudi Embassy was ransacked and burned. The Saudi kingdom and a number of its Sunni allies have cut or downgraded diplomatic relations with Tehran. In a number of Sunni-majority states, members of the Shiite minority have taken to the streets to protest Nimr's death.

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