Muslim pilgrims walk to cast their stones at a pillar symbolising the stoning of Satan during the annual haj pilgrimage in Mina, Saudi Arabia August 13, 2019. Millions of haj pilgrims began heading back to Mecca for final prayers on Tuesday as the world's largest annual gathering of Muslims wound down without incident despite the logistical challenges and escalating regional tensions. REUTERS/Umit Bektas
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