
Muslim pilgrims circle the Kaaba and pray at the Grand Mosque ahead of the annual haj pilgrimage. (Photo: REUTERS/Mohammed Salem)

Muslim pilgrims gather on Mount of Mercy at the plain of Arafat during the annual haj pilgrimage. (Photo: REUTERS/Mohammed Salem)

A Muslim pilgrim visits Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hira cave. (Photo: REUTERS/Mohammed Salem)

Muslim pilgrims circle the Kaaba and pray at the Grand Mosque ahead of the annual haj pilgrimage. (Photo: REUTERS/Mohammed Salem)

Muslim pilgrims gather on Mount of Mercy at the plain of Arafat during the annual haj pilgrimage. (Photo: REUTERS/Mohammed Salem)

Muslim pilgrims gather on Mount of Mercy at the plain of Arafat during the annual haj pilgrimage. (REUTERS/Mohammed Salem)

Muslim pilgrims pray on Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hira cave. (Photo: REUTERS/Mohammed Salem)

Workers prepare the Kiswa, a silk cloth that covers the Kaaba, the sacred building at the centre of the Grand Mosque, ahead of the annual haj pilgrimage, at a factory in the holy city of Mecca. (Photo: REUTERS/Mohammed Salem)

Muslim pilgrims gather on Mount of Mercy at the plain of Arafat during the annual haj pilgrimage. (REUTERS/Mohammed Salem)

Muslims pilgrims sleep on the Mount Al-Noor, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel in the Hira cave. (Photo: REUTERS/Mohammed Salem)