The Pentagon said Sunday a U.S. drone strike killed Islamic State leader Osama al-Muhajer in eastern Syria. U.S. Central Command said in a statement that no civilians were killed in the drone strike, but said it was assessing reports of a civilian injury. The claims could not be independently verified. CENTCOM said the U.S. strike was carried out by the same MQ-9 drones that were harassed by Russian military aircraft in separate incidents last week in Syrian airspace.