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Muslim pilgrims pray on a rocky hill called the Mountain of Mercy, some touching a marker at its peak, on the Plain of Arafat, near the holy city of Mecca, Saudi Arabia, Oct. 14, 2013.

A Muslim pilgrim touches a marker at the top of a rocky hill called the Mountain of Mercy, on the Plain of Arafat near the holy city of Mecca, Saudi Arabia, Oct. 14, 2014.

Muslim pilgrims pray near fruit carts in Arafat, near the holy city of Mecca, Saudi Arabia, Oct. 14, 2013.

A Muslim pilgrim wears medical mask as he walks in Arafat near the holy city of Mecca, Saudi Arabia, Oct. 14, 2013.

Muslim pilgrims pray at the door of the Kabaa, the cube-shaped structure in the city’s Grand Mosque that Muslims around the world face in prayer five times a day in the Muslim holy city of Mecca, Saudi Arabia, Oct. 13, 2013.

Muslim pilgrims pray at the Grand Mosque in the holy city of Mecca, Saudi Arabia, ahead of the annual Hajj pilgrimage, Oct. 10, 2013.

Muslim pilgrims pray atop Mount Thor in the holy city of Mecca, Saudi Arabia, ahead of the annual Hajj pilgrimage, Oct. 11, 2013.