Shi'ite pilgrims gather in Iraq's Kerbala to mark Arbaeen

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Undeterred by the threat of Sunni Islamic State militants, hundreds of thousands of Shi'ite pilgrims gather in the Iraqi holy city of Kerbala to mark Arbaeen which marks the end of a 40-day mourning period for the death of Imam Hussein, the grandson of the Prophet Mohammad. Rough Cut (no reporter narration).