ISIS has captured the distrcit of Zain from Jaish al-Islam in southern Damasucs, according to reports. The recent ISIS advance was a part of the wider effort of the terrorist group to expand its influence in the area.
ISIS already controls a large part of the Yarmouk Refugee Camp and the nearby districts. If the ISIS influence grows further, it may become the only influential militant group in the pocket. So far, Hayat Tahrir al-Sham and Jaish al-Islam have not been able to counter the ISIS expansion.