Iranian security forces detained at least 600 women in Tehran alone on the one-year anniversary of Mahsa Amini's death on September 16, according to the Committee to Follow-Up on the Status of Detainees.
Citing information provided by the families of the detainees, the group said that the majority of those detained have since been released on bail.
However, 130 women are still being held in the Quarantine Ward of Qarchak women's prison, south of the capital. Their cases have been referred to the prosecutor's office.
The report also provides a breakdown of arrests across Iran.
For instance, it said that 12 people who had gathered in the main square of Abarkoh, in central Yazd province, on the evening of September 16 were arrested at their homes overnight.
As many as 20 individuals were also apprehended in Dehdasht, in the southwestern province of Kohgiluyeh and Boyer-Ahmad.
Protests erupted across Iran on September 16 amid a tight clampdown on any gatherings as one year passed since Amini's death while in police custody for allegedly wearing her headscarf improperly.
The tragedy sparked monthslong demonstrations demanding fundamental changes – the greatest threat to the country’s leadership since the 1979 Islamic Revolution.