Fighters from Iraq's Islamist Shi'ite militias pose for pictures before departing to Syria from Baghdad, June 11, 2013. Syria is splintering the Middle East along a divide between the two main denominations of Islam, becoming a battlefield in a proxy war between Assad's main regional ally, Shi'ite Iran, and his Sunni enemies in Turkey and the Gulf Arab states. As the Syrian war grinds into its third year, sectarian killings are increasing, while hardline Sunni clerics are declaring Jihad or holy war on the

Tracing Syrian Conflict Back to Iraq’s Civil War

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Fighters from Iraq's Islamist Shi'ite militias pose for pictures before departing to Syria from Baghdad, June 11, 2013. Syria is splintering the Middle East along a divide between the two main denominations of Islam, becoming a battlefield in a proxy war between Assad's main regional ally, Shi'ite Iran, and his Sunni enemies in Turkey and the Gulf Arab states. As the Syrian war grinds into its third year, sectarian killings are increasing, while hardline Sunni clerics are declaring Jihad or holy war on the

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