Women have been at the forefront of escalating protests in Iran sparked by the death in custody of a woman detained for breaking hijab laws.
Crowds cheered when women burned their hijabs on a bonfire in Sari on Tuesday, the fifth successive day of unrest.
Activists said a woman was among three protesters shot dead by security forces in Urmia, Piranshahr and Kermanshah.
Authorities accused protesters of killing two civilians in Kermanshah as well as a police assistant in Shiraz.
At least seven people are now reported to have been killed since protests against the hijab laws and morality police erupted after Mahsa Amini's death.