The U.S. led coalition in Iraq says it is investigating reports that coalition airstrikes killed as many as 100 civilians in western Mosul this month. Military officials called the death of civilians in Iraq's northern city of Mosul a terrible tragedy. The U.S. Defense Department has said an early examination showed coalition warplanes attacked at the place where civilians reportedly were killed on March 17. Iraqi forces, with coalition air support, are working to capture western Mosul from Islamic State fighters. The Islamic State group has controlled the area since 2014.