Iranian pilgrims stayed away from the 2016 hajj after regional rivals Saudi Arabia, custodian of the sites in the west of the kingdom, and Iran failed to agree on arrangements and logistics.
Arrangements for the hajj, a religious duty which devout Muslims must accomplish at least once in their lifetime, are thorny and security paramount for the two million pilgrims who throng Islam's holiest sites in western Saudi Arabia.
Riyadh issued a death toll of 769, while figures compiled from foreign officials in more than 30 countries gave a tally of around 2,300 dead.
Tehran reported the largest number of stampede victims, with 464 Iranians among the dead.
"They were murdered, they (Saudi authorities) didn't help them," said Reza, a 63-year-old former oil company official, seated in the lobby of a Mecca hotel.
But Reza said that new security measures now left him feeling safer. "Everything is clear this year," he said, speaking in English.
Iranian authorities say more than 86,000 Iranian pilgrims are taking part in this year's hajj, each equipped with an identity bracelet in case of any accident.
The "made-in-Tehran" bracelets can be connected to smartphones, allowing access to information on the hajj.
Iran lambasted Saudi Arabia in the months following the stampede, condemning its organisation of the hajj and questioning the kingdom's very right to serve as custodian of Islam's holiest places.
Tehran and Riyadh stand on opposing sides in several regional disputes, including the conflicts in Syria, Yemen and Bahrain, as well as this year's Gulf diplomatic crisis between Qatar and a Saudi-led Arab bloc.
But a breakthrough accord on Iranian pilgrims taking part in this year's hajj was struck in March after several months of negotiations during which the two Gulf states traded bitter recriminations.
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