State media claimed that Khaled Maarouf, a son of Syrian Revolutionaries Front leader Jamal Maarouf, was killed in a “terrorist attack” car bombing at an SRF checkpoint in Deir Sinbul in Idlib; another report said Jamal may also have been injured in the attack. The SRF recently agreed to a ceasefire with the Islamic State in Reef Dimashq. Regime forces clashed with the Islamic State in Deir Izzour near the military airport. The Islamic State is continuing to destroy Sufi shrines throughout Syria. Zahran Alloush, leader of the Islam Army, warned that the group will start executing captured Syrian pilots in response to regime airstrikes.