ISIS' retreat accelerates, but reports of its demise are exaggerated

Updated 6:49 AM ET, Thu September 7, 2017

(CNN)Syrian troops broke ISIS' three-year siege of Deir Ezzor -- a strategic city in the eastern part of the country -- on Tuesday, marking the latest in a series of setbacks for the terror group.

In recent weeks, ISIS has been driven from one refuge to the next as its territory in Iraq and Syria continues to shrivel.
In late August, Iraqi security forces surrounded the town of Tal Afar, some 80 kilometers (50 miles) west of Mosul. Desp