Southern Front rebels attacked an ISIS-affiliated group in the countryside of Quneitra on Tuesday, killing dozens, activists said.
On Monday, Jaish al-Jihad, an Islamist group that pledged allegiance to ISIS, had ambushed fighters of the Suyouf al-Haq brigade near the occupied Golan Heights, killing 19 fighters.
In response, rebels active in Daraa province stormed the stronghold of Jaish al-Jihad in the villages of al-Qahtaniya and al-Hamidiya, rescuing fighters who were held captive following the ambush.
Dar al-Adel (The Justice House), a powerful judiciary body in Daraa, has called on rebels to fight Jaish al-Jihad and all groups affiliated to ISIS.