Iranian security forces released Mahsa Amini's father on Saturday after briefly detaining and warning him against marking the anniversary of her death, a human rights group said.
A source close to the family confirmed a report by the Norway-based human rights group Hengaw that Amjad Amini was arrested as he was leaving his house in western Iran.
Mahsa Amini's death in police custody a year ago unleashed months of anti-government protests that spiralled into the biggest show of opposition to the authorities in years.
Iranian officials were not immediately reachable by Reuters for comment.


Hurricane Melissa begins lashing Jamaica as 'catastrophic' Category 5 storm
No resolution as Afghanistan, Pakistan end peace talks in Istanbul
Japan PM Takaichi plans to recommend Trump for Nobel Peace Prize
Two killed in underground explosion at Australian silver mine
UN chief 'gravely' concerned about situation in Sudan
