The Sunni-Shia divide: Where they live, what they believe and how they view each other
Iraq and Iran are two of only a handful of countries that have more Shias than Sunnis.
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This week Sunni and Shia Muslims ushered in the Islamic New Year and the beginning of the holy month of Muharram. For Shias, the month also is a time to mourn the events that sparked the centuries-old schism between Shia and Sunni Muslims. An analysis of polls conducted in 2011-2012 finds high levels of concern about sectarian tensions in several countries where Sunnis and Shias live side by side.
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