Reform activist Azar Mansouri "was released from prison just minutes after bail was paid," Mansouri's lawyer, Hojjat Kermani, said, according to the Isna news agency.
Mansouri is accused of threatening the unity of the country and questioning the constitution. Hostile propaganda and secret subversive activities were also included in the charges when she was arrested less than a week ago.
Two more reform activists, Ebrahim Asgharzadeh and Mohsen Aminzadeh, were arrested at the same time.
There is no independent or confirmed information on how many people have been arrested following the regime's brutal, deadly crackdown on protesters in Iran.
