SOHR claims that the regime killed 18 people, including three children, while shelling the town of Daraa in southern Syria.The US dropped graphic anti-jihadist leaflets over the Islamic State-held city of Raqqa. The Organization for the Prohibition of Chemical Weapons will investigate claims of a chemical weapons attack on the village of Sarmin that killed sex and wounded dozens. The UN doubled its estimate of Syrians living in besieged areas to about 440,000. An Islamic State suicide bomber hit a Kurdish checkpoint in the city of Hasakah, killing one and injuring another. A Hezbollah commander and two fighters were reportedly killed by Syrian rebels near the Lebanese border.