Thousands of Syrians who fled a government offensive in the southwestern province of Dara’a are now at risk from scorpions, snakes, disease and dehydration.

At least 15 Syrians have died in camps near the Jordanian border because of “scorpion bites, dehydration and diseases transmitted through contaminated water,” according to a report published this week by the United Nations Office for the Coordination of Humanitarian Affairs. Twelve of the dead were children; two women and one elderly man also died.

More than 320,000 people in the Dara’a region have been displaced by the fighting, according to the United Nations. Most are living in campsites near the Jordanian border and the Israeli-controlled Golan Heights without adequate shelter, food or water. Thousands are sleeping in the open desert.

Temperatures there can climb above 110 degrees Fahrenheit during the day, and then plunge at night.

On Friday, Syrian government forces captured the main border crossing with Jordan as part of a deal with rebels in the area. The deal put the government back in charge of the critical transit point for the first time since 2015 but it was unclear whether it would help the displaced people camping on the border.