The United States military says it has killed a leader of the ISIL (ISIS) group in eastern Syria in a drone strike. The strike on Friday resulted in the death of Osama al-Muhajer, the US Central Command said in a statement on Sunday. "We have made it clear that we remain committed to the defeat of ISIS throughout the region," US Central Command (CENTCOM) chief General Michael Kurilla said, using another acronym for the ISIL armed group. "ISIS remains a threat, not only to the region but well beyond," he added. According to CENTCOM, no civilians were killed in the operation but coalition forces are "assessing reports of a civilian injury".