At least 220 people are reported to have died and hundreds more have been injured in a crush during a pilgrimage to Mecca.
Saudi Arabia's civil defence service released Thursday's toll and said rescue operations were underway after the stampede in Mina, where almost two million pilgrims were taking part in the last major rite of the Hajj.
It was not immediately clear what had caused the stampede.
Pilgrims had converged on Mina just outside Mecca to throw pebbles at one of three walls representing Satan, the symbolic 'stoning of the devil' that marks the last day of the event.
The world's 1.5 billion Muslims were on Thursday marking Eid al-Adha, the Feast of Sacrifice, the most important holiday of the Islamic calendar.
The Hajj is among the five pillars of Islam and every capable Muslim must perform it at least once in a lifetime.
In the past the pilgrimage was for years marred by stampedes and fires, but it had been largely incident-free for nearly a decade following safety improvements.
Preparations for this year's Hajj were marred when on September 11 a construction crane collapsed at Mecca's Grand Mosque, Islam's holiest site, killing 109 people.
