What has happened: Protests erupted across Iran on Friday after the government unexpectedly announced its decision to ration petrol and remove subsidies, sending prices soaring by at least 50%.
On Tuesday, a spokesman for the office of the United Nations high commissioner for human rights told a news conference in Geneva that it was deeply concerned by reported violations of worldwide norms and standards on the use of force, including the firing of live ammunition, against demonstrators.
Mr Colville said it was extremely hard to verify the overall number of deaths.
The death toll for the three days of protests rose to at least 12; hundreds were injured; and more than 1,000 people have been arrested. It also urged protesters to demonstrate peacefully.
State television said a ceremony would be held for Ebrahimi and Rezaie in Tehran on Tuesday afternoon.
He said that "everybody is responsible for their actions" and called on the people to separate their actions from "rioters" and instead to refer them to "security and law enforcement agencies and the judiciary".
When the demonstrations broke out on Friday, drivers stopped their vehicles on major thoroughfares in Tehran to block traffic.
The protests soon turned violent and spread to more than 40 cities and towns, with banks, petrol stations and other public property set ablaze and shops looted. Amnesty further that it "believes that the real demise toll may perhaps be a great deal increased, with some reviews suggesting as lots of as 200 have been killed".
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The Amnesty report comes after a United Nations agency earlier said it feared the unrest may have killed "a significant number of people".
The protests were prompted by widespread anger among the Iranian people, who have seen their savings evaporate amid scarce jobs and the collapse of the national currency, the rial, since President Trump unilaterally withdrew America from the nuclear deal over a year ago and imposed sanctions.
Snipers have shot into crowds of protestors from rooftops and, in one case, from a helicopter, Amnesty said.
Social media footage has shown protesters burning pictures of senior officials and calling on clerical rulers to step down, as well as clashes between security forces and protesters.
Government spokesman Ali Rabiei told a news conference that there had been "gatherings in some cities, in some provinces" on Monday, but that "tomorrow and the day after we won't have any issues with regard to riots".
Digital rights organisation Netblocks said the shutdown was nearly total with national connectivity at just five per cent of usual levels, and mobile operators MCI, Rightel and IranCell being offline.
On Tuesday, the Iranian government began rushing out promised payments to some 60 million citizens, the purported goal behind the petrol price hike decision.
This photo released by the Iranian Students' News Agency, ISNA, shows scorched public buses that remained on the street after protests that followed authorities' decision to raise gasoline prices, in Tehran, Iran, Sunday, Nov. 17, 2019.
The US has condemned Iran for using "lethal force".