The Syrian military said the airstrike hit a base in the eastern city of Deir el-Zour that is surrounded by IS, allowing the extremists to advance. "Coalition forces would not intentionally strike a known Syrian military unit," the military statement said. The Syrian military said the airstrikes enabled an IS advance on a hill overlooking the air base. He said IS militants surrounding the air base launched an attack on the Syrian army positions after the air strike. Russia's military said Syrian rebels violated the cease-fire dozens of times over the past day, including with strikes on military and civilian targets in Aleppo.

Source: ABC News September 17, 2016 10:09 UTC