This picture taken on August 5, 2019 shows smoke billowing above buildings during a reported air strike by pro-regime forces on Khan Sheikhun in the south of the northwestern Syrian province of Idlib. Damascus and Russia resumed air strikes on Idlib in northwest Syria on August 5, a monitor said, scrapping a ceasefire for the jihadist-run bastion and accusing the regime's opponents of targeting a Russian air base. The northwestern region, which hosts some three million people, is one of the last major centres of resistance to President Bashar al-Assad's regime after eight years of war. / AFP / Omar HAJ KADOUR
Smoke billows above buildings during a reported air strike in May by pro-regime forces in the north-west Syrian province of Idlib. AFP

Clashes in northwest Syria kill 55