sentences:  The United Nations, the governments of the United States, United Kingdom, Turkey, Saudi Arabia, France, and Israel, as well as Human Rights Watch have attributed the attack to the forces of Syrian President Bashar al-Assad.The Assad government denied using any chemical weapons in the air strike.The Idlib Governorate clashes (July 2017) were a series of military confrontations between Ahrar al-Sham and Hay'at Tahrir al-Sham.