The pilgrims died as a result of exposure to extreme sun and heat, Jordan’s official news agency said, as hundreds of thousands poured into Mecca in Saudi Arabia for the Muslim holy trip.

The pilgrims died as a result of exposure to extreme sun and heat, the agency said, based on a report from Jordan’s Foreign Ministry. In Mecca, temperatures reached nearly 110 degrees Fahrenheit on Sunday, and recent studies have indicated that climate change will increase health risks there.

An additional 17 pilgrims were missing, the agency said.