April 13 (UPI) -- The U.S-international coalition fighting the Islamic State said an airstrike misfire killed 18 members of the Syrian Democratic Forces, the allied force on the ground.
The coalition -- named the Combined Joint Task Force: Operation Inherent Resolve -- said the incident occurred Tuesday when the SDF battled the Islamic State, also known as Daesh, ISIL and ISIS, south of the Syrian city of al-Tabqah.