“The warplanes bombarded countryside around Jisr al-Shughour on the western edge of the rebel enclave of Idlib after weeks of lull, killing 13 civilians but no fighters, according to the Syrian Observatory for Human Rights and a rebel source,” the news agency reads.
Washington warned Assad that the response will be “quick” if the chemical weapon is applied.
Leaders of Russia, Turkey and Iran are to meet in Iran on September 7 to discuss the situation in north-west Syria.
Earlier, on September 4, Russia resumed airstrikes in Syria. On August 15, Russia sustained attacking Idlib, yet, the forces loyal to Syrian leader Bashar al-Assad continued bombarding and shelling at rebels.