“I saw it with my own eyes – they fired directly into lines of protesters, and people fell where they stood.”

Omid’s voice was shaking as he spoke, fearful of being traced. Breaking the wall of silence between Iran and the rest of the world takes immense courage, given the risk of reprisals by the authorities.

Omid, in his early 40s and whose name we have changed for his safety, has been protesting on the streets of a small city in southern Iran over the past few days against worsening economic hardship.

He said security forces had opened fire at unarmed protesters in his city with Kalashnikov-style assault rifles.

“We are fighting a brutal regime with empty hands,” he said.

The BBC has received similar accounts of the crackdown by security forces following the widespread protests across the country last week.

Since then, internet access has been cut by the authorities, making reporting from Iran more difficult than ever. BBC Persian is banned from reporting inside Iran by the government.

One of the largest nationwide anti-government protests took place on Thursday, the twelfth night of demonstrations. Many people appear to have joined the protests on Thursday and Friday after calls from Reza Pahlavi, the exiled son of the last shah of Iran who was overthrown in the 1979 Islamic revolution.