In December, 2014, the U.S. announced that airstrikes had killed senior ISIS limb Hajii Mutazz, aka Fadel Ahmed Abdullah al-Hiyali aka Abu Muslim al Turkmani. He was described by the U.S. as the "right hand man" of leader al Baghdadi.
Today the U.S. announced he was killed in an airstrike this week on August 18.
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