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Islamic State: Iraq's Shia defy IS threat

Tens of thousands of members of Baghdad's Shia community have visited a holy shrine to mark a significant day in the faith's calendar.

But the faithful are not just remembering one of their revered imams - they are showing strength and political force in the face of the ongoing threat from Islamic State, who regard the Shia as heretics.

Lyse Doucet reports from Baghdad.

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