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King Salman of Saudi Arabia has ordered a full review of the Hajj pilgrimage after more than 700 people died in a crush outside the Muslim holy city of Mecca. Newsday heard from Professor Keith Still who teaches Crowd Science at Manchester Metropolitan University in the UK and has worked in Saudi Arabia on crowd control at Jamarat Bridge. Pilgrims were making their way towards that bridge when tragedy struck. (Photo: Muslim pilgrims gather around the victims of a crush in Mina, Saudi Arabia during the annual hajj pilgrimage Credit: AP)