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Islamic State group militants posing in Yarmouk Palestinian camp, located in a suburb of Damascus, Syria, that is partially now under their control, April 7, 2015 (Credit: AP/SIPA USA/Balkis Press)

Islamic State group militants posing in Yarmouk Palestinian camp, located in a suburb of Damascus, Syria, that is partially now under their control, April 7, 2015 (Credit: AP/SIPA USA/Balkis Press)