An Iranian official in the region said on Sunday the authorities had verified at least 5,000 people had been killed in protests in Iran, including about 500 security personnel, blaming "terrorists and armed rioters" for killing "innocent Iranians".

The official, who declined to be named due to the sensitivity of the issue, also told Reuters some of the heaviest clashes and highest number of deaths were in the Iranian Kurdish areas in northwest Iran, a region where Kurdish separatists have been active and where flare-ups have been among the most violent in past periods of unrest, Reuters reported. 

"The final toll is not expected to increase sharply," the official said, adding that "Israel and armed groups abroad" had supported and equipped those taking to the streets.