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An woman has been arrested after a photograph of her eating at a restaurant without the government-mandated went viral.

The picture showed two unveiled women sitting in an Iranian restaurant in Tehran - one was identified as Donya Rad and the other a friend of hers who has not been named.

"Yesterday after this photo was published, the security agencies contacted my sister Donya Rad and asked her to give some explanations," her sister Dina tweeted after the photo went .

"Today, after going where she was told, she was arrested. After a few hours of silence, Donya told me in a short call that she was transferred to ward 209 of Evin prison."

This is a notorious wing of Tehran prison which is reputedly run by the intelligence ministry and where torture is common.

"Our family is very concerned about her well-being," she added.

دیروز پس از انتشار عکس فوق نهادهای امنیتی با خواهرم -دنیا راد- تماس گرفتندو او را برای ادای پاره‌ای توضیحات احضار کردند. امروز و پس از مراجعه دنیا به محل تعیین شده، او را دستگیر کردند. پس از چند ساعت بی خبری دنیا طی تماس کوتاهی با من گفت که به بند۲۰۹زندان اوین انتقال داده‌شده‌است

— Dina Rad (@DinaRad86)

Observers say that such arrests are part of a campaign of intimidation by the Iranian government, which has faced waves of protests in recent days over the death in custody of 22-year-old Mahsa Amini.

"The goal of the regime is to intimidate people by its brutality and by the widespread arrests. Iranians, particularly Iranian women, have shown that they are not so easily scared off and have continued to come out. What they need are strategies for victory against the regime," Iranian author and analyst Arash Azizi told ������.

He added that the protests have "galvanised" the nation in an "unprecedented way".

"[They] have really shown that getting rid of the regime is a very real wish for many if not most Iranians," though it is hard to predict the future of the current regime led by Ayatollah Ali Khameini," he said

"This government has shown that it knows no end to its brutality, especially when it comes to its own survival. But the more international attention there is, the more costly suppression will be."

Rad's arrest comes as protests continue to rock Iran after Kurdish-Iranian woman ��died in religious police custody earlier this month for allegedly not wearing her hijab properly. Her family and witnesses say she was beaten into a coma, leading to her death several days later.

Amini's death has sparked rage against the Iranian regime which has responded with violence.

Women have been at the forefront of the protests, often filmed cutting their hair, as well as taking off and burning headscarves��in public places while chanting anti-government slogans.

Headscarves and other 'modest dress' are mandatory in Iranian law.

In February, Iran's Supreme Leader Ayatollah Ali Khamenei ruled that women depicted in cartoons or animated films must wear the hijab.

In 2020, two senior Iranian clerics called on police to "make surroundings unsafe" for women who do not wear the hijab.