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A Muslim boy looks on during the Maghrib late afternoon prayer at the Grand Mosque in the Saudi holy city of Mecca, on September 20, 2015. The annual hajj pilgrimage begins on September 22, and more than a million faithful have already flocked to Saudi Arabia in preparation for what will for many be the highlight of their spiritual lives. AFP PHOTO / MOHAMMED AL-SHAIKH (Photo credit should read MOHAMMED AL-SHAIKH/AFP/Getty Images)

A Muslim boy looks on during the Maghrib late afternoon prayer at the Grand Mosque in the Saudi holy city of Mecca, on September 20, 2015. The annual hajj pilgrimage begins on September 22, and more than a million faithful have already flocked to Saudi Arabia in preparation for what will for many be the highlight of their spiritual lives. AFP PHOTO / MOHAMMED AL-SHAIKH        (Photo credit should read MOHAMMED AL-SHAIKH/AFP/Getty Images)