Muslim pilgrims take pictures while standing amongst pigeons outside the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims walk towards the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim walks under a bridge in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims wear protective masks as they walk on a road in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims stand outside the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims are seen on a sidewalk outside the Grand mosque in the holy city of Mecca ahead of the annual haj pilgrimage September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims move in circles around the holy Kaaba from the third floor at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims move in circles around the holy Kaaba from the third floor at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims move in circles around the holy Kaaba from the third floor at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray as they visit Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim uses her mobile phone to light up as she reads from the Quran after visiting Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim prays as he visits Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim prays as he visits Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim prays as he visits Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim raises her hands to pray after visiting Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





Saudi policemen watch monitor screens showing footage from cameras set up around the holy places, in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims look at the city landscape after visiting Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim prays as he stands in front of Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim makes his way to Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim makes his way to Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim climbs up the Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim visits Hera cave, where Muslims believe Prophet Mohammad received the first words of the Koran through Gabriel, at the top of Mount Al-Noor during the annual haj pilgrimage in the holy city of Mecca, September 21, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray around the holy Kaaba at the Grand Mosque ahead of the annual haj pilgrimage in Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim holds a tree as he stands on the roadside ahead of the annual haj pilgrimage in Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims wait for bus ahead of the annual haj pilgrimage in Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





A Muslim pilgrim sits as he holds a book on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims touch a rock atop Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims pray on Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)





Muslim pilgrims touch a rock atop Mount Mercy on the plains of Arafat during the annual haj pilgrimage, outside the holy city of Mecca September 22, 2015. (Photo by Ahmad Masood/Reuters)