More than 1,300 people died during this year’s Hajj pilgrimage in Saudi Arabia as the faithful faced extreme high temperatures at Islamic holy sites in the desert kingdom, Saudi authorities said.

Saudi Health Minister Fahd bin Abdurrahman Al-Jalajel said that 83% of the 1,301 fatalities were unauthorized pilgrims who walked long distances in soaring temperatures to perform the Hajj rituals in and around the holy city of Mecca.

Speaking with the state-owned Al Ekhbariya TV, the minister said 95 pilgrims were being treated in hospitals, some of whom were airlifted for treatment in the capital, Riyadh. He said the identification process was delayed because there were no identification documents with many of the dead pilgrims.

He said the dead were buried in Mecca, without giving a breakdown.

The fatalities included more than 660 Egyptians. All but 31 of them were unauthorized pilgrims, according to two officials in Cairo. Egypt has revoked the licenses of 16 travel agencies that helped unauthorized pilgrims travel to Saudi Arabia, authorities said.

The officials, who spoke on condition of anonymity because they were not authorized to brief journalists, said most of the dead were reported at the Emergency Complex in Mecca’s Al-Muaisem neighborhood. Egypt sent more than 50,000 authorized pilgrims to Saudi Arabia this year.

Saudi authorities cracked down on unauthorized pilgrims, expelling tens of thousands of people. But many, mostly Egyptians, managed to reach holy sites in and around Mecca, some on foot. Unlike authorized pilgrims, they had no hotels to return to to escape the scorching heat.

In a statement Saturday, Egypt’s government said the 16 travel agencies failed to provide adequate services for pilgrims. It said these agencies illegally facilitated the travel of pilgrims to Saudi Arabia using visas that don’t allow holders to travel to Mecca.

The government also said officials from the companies have been referred to the public prosecutor for investigation.

According to the state-owned Al-Ahram daily, some travel agencies and Hajj trip operators sold Saudi tourist visas to Egyptian Hajj hopefuls, violating Saudi regulations which require exclusive visas for pilgrims. Those agencies left pilgrims in limbo in Mecca and the holy sites in scorching heat, the newspaper said.

The fatalities also included 165 pilgrims from Indonesia, 98 from India and dozens more from Jordan, Tunisia, Morocco, Algeria and Malaysia, according to an Associated Press tally. Two US citizens were also reported dead.