Hajj pilgrimage crush
Iran has led growing criticism of Saudi Arabia after at least 717 people died and 863 were injured in a stampede near the holy city of Mecca on Thursday.
Iran's Supreme National Security Council accused the Saudis of "incompetence" and urged them to "take responsibility" for the deaths.
Nigeria has dismissed remarks by the Saudi health minister blaming pilgrims for "not following instructions".
King Salman has ordered a safety review for the Hajj pilgrimage.
The Victoria Derbyshire programme looks at the background and events leading up to the crush.
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