Taraneh Alidoosti, 38, a prominent Iranian actor was arrested after she voiced support for the three-month-old protest movement triggered by the death of a woman in custody.
She was arrested "by order of the judicial authority" as she "did not provide documentation for some of her claims" about the protests, the judiciary said Saturday.
It added "some figures and a number of celebrities" including Alidoosti have been arrested "following some baseless comments about the recent events and the publishing of provocative material in support of the street riots".
She is best known for her role in the Oscar-winning 2016 film "The Salesman". Recently, she starred in the film "Leila's Brothers", which screened at this year's Cannes Film Festival.
The Islamic republic has been rocked by protests triggered by the September 16 death of Mahsa Amini, a 22-year-old Iranian, after her arrest for an alleged breach of the country's dress code.
On the day of Amini's death, Alidoosti posted a photo to Instagram with text saying: "Damnation to this captivity".
The caption to the post read: "Don't forget what Iran's women go through" and asked people to "say her name, spread the word".
On November 9, she posted an image of herself without a headscarf, holding a paper with the words "Woman, life, freedom", the main slogan of the protests.
