New Delhi, June 6 -- At least 49 people died of thirst after a truck broke down and they were stranded for days in the Sahara Desert in northern Niger, authorities said.

The victims, all Nigeriens, were returning home from a religious festival in Mali when the truck stopped running more than 80 kilometers (49 miles) west of Assamaka, near the borders with Mali and Algeria, Niger's Agadez region governorate said in an online post late Thursday.

Two men survived after trekking more than 50 kilometers (31 miles) to a water source and then continuing to Assamaka, where they alerted authorities, the governorate said.

A delegation sent to the scene by the Agadez Region Governor Gen. Ibra Boulama Issa learned the truck had traveled for severa...