A frame grab from video posted on May 19 shows Islamic State fighters receiving training in the eastern Syrian province of Deir el-Zour.
A frame grab from video posted on May 19 shows Islamic State fighters receiving training in the eastern Syrian province of Deir el-Zour. Uncredited Associated Press
A frame grab from video posted on May 19 shows Islamic State fighters receiving training in the eastern Syrian province of Deir el-Zour. Uncredited Associated Press