Saudi Arabia, under growing pressure to account for a crush that killed more than 700 people at the haj pilgrimage, on Friday suggested pilgrims failing to follow crowd control rules bore some blame for the worst disaster at the event for 25 years.
The kingdom's regional rival Iran expressed outrage at the deaths of 131 of its nationals at the world's largest annual gathering of people, and politicians in Tehran suggested Riyadh was incapable of managing the event.
"Death to the Saudi dynasty!" hundreds of demonstrators chanted at a protest in the Iranian capital Tehran.
Saudi Health Minister Khalid al-Falih said an investigation would be conducted rapidly and a final toll of dead and wounded calculated. At least 863 pilgrims were injured.
"The investigations into the incident of the stampede that took place today in Mina, which was perhaps because some pilgrims moved without following instructions by the relevant authorities, will be fast and will be announced as has happened in other incidents," Falih said in a statement.