DUBAI (Reuters) — Plainclothes Iranian security forces have rounded up thousands of people in a campaign of mass arrests and intimidation to deter further protests after crushing the bloodiest unrest since the 1979 Islamic Revolution, sources told Reuters.
Modest protests that began last month in Tehran’s Grand Bazaar over economic hardship unleashed long-suppressed wider grievances and swiftly escalated into the gravest existential threat to Iran’s Shi’ite theocracy in nearly five decades, with protesters commonly calling for ruling clerics to step down.
Authorities cut internet access and stifled the unrest with overwhelming force that killed thousands, according to rights groups. Tehran blames “armed terrorists” linked to Israel and the United States for the violence.
Within days, plainclothes security forces launched a campaign of widespread arrests accompanied by an intensified street presence based around checkpoints, according to five activists who spoke on condition of anonymity from inside Iran.
They said detainees had been placed in secret lockups.
“They are arresting everyone,” one of the activists said. “No one knows where they are being taken or where they are being held. With these arrests and threats, they are trying to inject fear into society.”
Similar accounts were given to Reuters by lawyers, medics, witnesses and two Iranian officials speaking on condition of anonymity to avoid retribution by security services.
They said the roundups appeared aimed at preventing any serious revival of protests by spreading fear just as the clerical establishment faces rising external pressure.
Uncertainty over the possibility of military action against the Islamic Republic has lingered since U.S. President Donald Trump said last week that an “armada” was heading toward the country but that he hoped he would not have to use it.
On Wednesday, however, he doubled down on his threats by demanding Iran negotiate curbs on its nuclear programme, warning that any future U.S. attack would be “far worse” than one day of airstrikes last June on three nuclear sites.
Multiple Western and Middle Eastern sources told Reuters this week that Trump is weighing options against Iran that include targeted strikes on security forces and leaders to inspire protesters, although Israeli and Arab officials said air power alone would not topple the clerical establishment.
Targeted For Past Protests, Too
One of the activists said security forces were detaining not only people accused of involvement in the latest unrest but also those arrested during protests in previous years, “even if they had not participated this time, plus members of their families”.
The latest death toll compiled by the U.S.-based HRANA rights group stands at 6,373 – 5,993 protesters, 214 security personnel, 113 under-18s and 53 bystanders. Arrests stand at 42,486, according to HRANA.
Judiciary officials have warned that “those committing sabotage, burning public property and involved in armed clashes with security forces” could face death sentences.
The U.N. human rights office told Reuters on Thursday it understood that the number of detainees was very high and they were at risk of torture and unfair trials.

