Eighteen people, including four pro-regime fighters, were killed and more than 50 others are missing, the Syrian Observatory for Human Rights said. The Syrian desert is renowned for producing some of the best truffles in the world.

ISIS, which took control of entire swathes of the country from 2014, was territorially defeated in March 2019 by an international anti-jihadist coalition led by the United States and Kurdish forces. But cells of the jihadist organization scattered across the desert regularly carry out deadly attacks, particularly during the rainy season.