Hundreds of thousands of Muslims in Makkah are participating in the annual hajj pilgrimage, which starts Saturday.

(Pictures: AP/Amr Nabil).

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Muslim pilgrims circumambulate around the Kaaba, the cubic building at the Grand Mosque, ahead of the Hajj pilgrimage in the Muslim holy city of Mecca, Saudi Arabia, Wednesday, Aug. 7, 2019. 

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In this picture taken with slow shutter speed, Muslim pilgrims pray past Maqam Ibrahim or The Station of Abraham, the golden glass structure, center, at the Grand Mosque in the Muslim holy city of Mecca, Saudi Arabia, Wednesday, Aug. 7, 2019.

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Millions arrived this week in the holy city of Makkah

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A Saudi airport worker throws flowers as he welcomes Malaysian pilgrims at the Hajj Terminal at Jiddah airport, Saudi Arabia

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Iraqi pilgrims, in black, leave the Grand Mosque, in the Muslim holy city of Mecca, Saudi Arabia

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Members of the Saudi special forces perform during a military parade in preparation for the annual Hajj pilgrimage, in the Muslim holy city of Mecca, Saudi Arabia, Sunday, Aug. 4, 2019.