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PHOTO GALLERY: Muslim pilgrims pray on Mount Arafat in Saudi Arabia




A Muslim pilgrims prays on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

Muslim pilgrims pray on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

Muslim pilgrims sleep near the Grand Mosque in the Muslim holy city of Mecca, Saudi Arabia, early Tuesday, Sept. 22, 2015 (AP)

A Muslim pilgrim prays on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

A pilgrim reads the Muslim holy book, Quran, on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

Muslim pilgrims gather on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Tuesday, Sept. 22, 2015 (AP)

Muslim pilgrims visit Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

A pilgrim carries her son while she prays on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

A pilgrim reads the Muslim holy book, the Quran, on a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

A Muslim pilgrim prays on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Reuters)

Muslim pilgrims visit Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims pray underneath a rocky hill called the Mountain of Mercy, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Wednesday, Sept. 23, 2015 (AP)

Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims climb Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims perform prayers in Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims perform prayers in Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims visit Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

A Muslim pilgrim is sprayed with water as he visits Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims climb Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Muslim pilgrims perform prayers in Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015 (Reuters)

Saudi police keep watch at Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 23, 2015. (Reuters)