Amnesty International said that the number of people believed to have been killed during demonstrations in Iran that broke out on 15 November has risen to at least 208.

The real figure, added the organisation, is likely to be higher.

Dozens of the deaths have been recorded in Shahriar city in Tehran province – one of the cities with the highest death tolls.

"This alarming death toll is further evidence that Iran’s security forces went on a horrific killing spree, that left at least 208 people dead in less than a week. This shocking death toll displays the Iranian authorities’ shameful disregard for human life," said Philip Luther, Research and Advocacy Director for the Middle East and North Africa at Amnesty International.

Luther added: "Those responsible for this bloody clampdown on demonstrations must be held accountable for their actions. Since the Iranian authorities have previously shown they are unwilling to carry out independent, impartial and effective investigations into unlawful killings and other arbitrary use of force against protesters, we are calling on the international community to help ensure accountability."