More than 1,000 people died during this year’s Hajj pilgrimage in Saudi Arabiaas the faithful faced extreme high temperatures at Islamic holy sites in the desert kingdom, officials said Sunday.

More than half of the fatalities were people from Egypt, according to two officials in Cairo. Egypt revoked the licenses of 16 travel agencies that helped unauthorized pilgrims travel to Saudi Arabia, authorities said.

Saudi Arabia has not commented on the deaths during the pilgrimage, which is required of every able Muslim once in their life.