At least 717 people have died and hundreds more are injured after a stampede on the edge of Mecca, Saudi authorities say.
Civil defence officials said more than 800 were also injured in the crush at Mina, on the outskirts of the Muslim holy city, where some two million people are at the annual pilgrimage.
Some 4,000 rescue workers and 220 ambulances are involved in the emergency operation, officials said.
Pictures on social media showed a devastating scene, with dozens of bodies lying among water bottles and crushed wheelchairs.
Mina is where pilgrims go to carry out a symbolic stoning of the devil by throwing pebbles against stone walls.
Witnesses said the stampede happened on Street 204, one of the main roads leading through the camp set up for pilgrims to get to the three stone walls, known as Jamarat.
More than 160,000 tents are set up in the area.
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