
Muslim pilgrims gather on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 20, 2018.

Muslim pilgrims gather on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 20, 2018.

Muslim pilgrims gather on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 20, 2018.

A Muslim pilgrim visits the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018

Muslim pilgrims walk towards their tents in Mina ahead of annual Haj pilgrimage near the holy city of Mecca, Saudi Arabia August 19, 2018.

Mazen, 1, a Muslim pilgrim gather with his parents on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 20, 2018

Muslim pilgrims arrive at the plains of Arafat on the eve of the annual Haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 19, 2018

A Muslim pilgrim prays at the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018.

The Clock tour is pictured from the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018

Muslim pilgrims pray while they the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018.

A Muslim pilgrim visits the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018.

A Muslim pilgrim prays as she gather with others on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca, Saudi Arabia August 20, 2018

Muslim pilgrims walk towards their tents in Mina ahead of annual Haj pilgrimage near the holy city of Mecca, Saudi Arabia August 19, 2018

Muslim pilgrims' tents are pictured in Mina ahead of annual Haj pilgrimage near the holy city of Mecca, Saudi Arabia August 19, 2018. (Reuters)

A Muslim pilgrim from Turkey visits the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018. (Reuters)

A Muslim pilgrim takes a selfie at the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hera cave, ahead of annual Haj pilgrimage in the holy city of Mecca, Saudi Arabia August 18, 2018 (Photo: Reuters)