BAGHDAD, IRAQ - JUNE 21: An Iraqi flag pokes up from a gun barrel as Iraqi Shiites of the Mahdi Army militia loyal to cleric Moqtada al-Sadr vow to fight ISIS in a show of strength in a military parade on June 21, 2014 in the Sadr City district of Baghdad, Iraq. In a lightning advance, the Al Qaeda-inspired Sunni jihadists of the Islamic State in Iraq and the Levant (ISIS) have taken control of western and central sectors of Iraq, and vowed to attack Shiite shrine cities of Karbala and Najaf. (Photo by Scott Peterson/Getty Images)
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