Fighters of the Syria Democratic Forces prepare to fire a mortar shell towards positions held by Islamic State fighters in northern province of Raqqa

Fighters of the Syria Democratic Forces prepare to fire a mortar shell towards positions held by Islamic State fighters in northern province of Raqqa

Fighters of the Syria Democratic Forces prepare to fire a mortar shell towards positions held by Islamic State fighters in northern province of Raqqa, Syria May 27, 2016. REUTERS/Rodi Said

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