(Business Insider) Omar al-Shishani stands next to the group's spokesman among a group of fighters as they declare the elimination of the border between Iraq and Syria in 2014.
On Tuesday, the US military cautiously celebrated what has the potential, if confirmed, of being a major victory in the fight against ISIS.
A US airstrike on Tuesday was believed to have killed ISIS's "minister of war," Abu Omar al-Shishani, also called Omar the Chechen.
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If true, such a strike will seriously hinder ISIS's tactical abilities on the ground as well as the group's ability to recruit foreign fighters from the Caucasus region.