The pilgrims suffocated or were trampled to death Thursday when two massive crowds converged on a narrow street, in the worst disaster to occur during the annual pilgrimage in a quarter-century.
Shiite Iran has accused its Sunni archrival Saudi Arabia of mismanaging the pilgrimage, which annually draws some 2 million people from 180 countries.
Iranians comprise the largest group of casualties identified so far. Iranian state TV says Ghazanfar Roknabadi, a former ambassador to Lebanon, as well as two Iranian state TV reporters and a prominent political analyst are among those still missing.
He said Saudi authorities blocked a road used by hajj pilgrims to allow a royal convoy to pass through, causing the deadly convergence in the town of Mina on the outskirts of Mecca.
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"They have to know that we will pursue the trial of Al-Saud for the crime they have committed against the hajj pilgrims through international courts and organizations."
Iran's Foreign Ministry meanwhile summoned the Saudi charge d'affaires for a third time in three days to protest Riyadh's handling of the disaster.
The Saudi Health Ministry said today on Twitter that the death toll in the hajj disaster stood at 769 pilgrims killed and 934 injured, updating previous figures. It did not offer nationalities for the dead and injured.
Iranian state TV said 136 Iranian pilgrims were among the dead and 85 were injured, while 344 Iranians remain missing. India's government meanwhile raised its estimated death toll of Indian citizens to 18, while Pakistan raised its estimated death toll to 11.
Muslims believe the devil tried to talk the Prophet Ibrahim, or Abraham as he is known in the Bible, out of submitting to God's will in Mina. In one of the final steps of the hajj, pilgrims throw stones at three large pillars in a symbolic casting away of evil.