Iran’s authorities have detained Iranian-German activist Nahid Taghavi (pictured).

Taghavi was seized at her home in Tehran on October 15 and taken away without a warrant or a charge. Her daughter Mariam Claren said she has no information on what has happened or where Taghavi is being held.

“No sign of life from my mother for 7 days! I demand clarification, I demand intervention, I demand her release! #FreeNahid,” Claren wrote on Twitter.

Claren tagged the German Foreign Office and Foreign Minister Heiko Maas, hoping to draw their attention to the case, and has informed the Berlin Embassy in Tehran.

She called on Iranian authorities for transparency and her mother’s release.

Claren said that her uncles went to Evin Prison to deliver Taghavi’s medicines but were unable to do so. The activist’s lawyer has been unable to meet her.

Taghavi, 66, is retired and has no political background, but has been active on women’s rights and civil rights issues.

The Frankfurt-based International Society for Human Rights said Friday that Taghavi is being held in solitary confinement at Evin Presiden.

ISHR spokesman Martin Lessenthin said, “The Islamic Republic pursues political goals with the imprisonment of persons with dual nationalities — they are thus a political bargaining chip for the regime.”

The Human Rights Activists News Agency said Taghavi has recently undergone surgery and is suffering from high blood pressure.

The activist has lived in Cologne since 1983 and was granted German citizenship in 2003. She had been able to commute between Tehran and Germany without any problem over the last 15 years.