Iraq's most senior Shia cleric has issued a call to arms to worshippers, to defend the country against an advance by the Sunni militant group known as the Islamic State of Iraq in the Levant, or ISIL. ISIL forces have captured large swaths of Iraq's north and are just tens of kilometers from the capital. As Henry Ridgwell reports for VOA from London, fears are growing of a Sunni-Shia sectarian war.
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