FILE - In this Wednesday, Sept. 3, 2014 file photo, Iraqi security forces and Shiite militiamen fire at Islamic State group positions during an operation outside Amirli, some 105 miles (170 kilometers) north of Baghdad, Iraq. When the Islamic State group staged a lightening advance across much of northern Iraq last year, it expanded its rule to about a third of the country, drawing in different groups with different motivations for taking up arms. In many cases, former rivals are now finding themselves in an uneasy alliance as they seek to combat the Sunni extremist group. Here are the groups involved in the anti-Islamic State war in Iraq and what they each hope to accomplish. (AP Photo, File) (The Associated Press)
FILE - In this Saturday, June 21, 2014 file photo, volunteers in the newly formed "Peace Brigades" raise their weapons and chant slogans against the al-Qaida-inspired Islamic State of Iraq and the Levant during a parade in the Shiite stronghold of Sadr City, Baghdad, Iraq. When the Islamic State gro...
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