Award-winning Iranian human rights lawyer Nasrin Sotoudeh was arrested on Wednesday (June 13th), AFP reported.
"A few hours ago Nasrin was arrested at home and transferred to Evin," her husband Reza Khandan wrote in a social media post.
The US Treasury recently imposed sanctions on Tehran's Evin Prison, used to house political prisoners, saying inmates are subjected to sexual and physical assaults and electric shock.
Sotoudeh, 55, one of the few outspoken advocates for human rights in Iran, recently represented several women arrested for protesting against the mandatory wearing of headscarves.
Tehran police said in February that 29 women had been detained for posing in public without their headscarves in the previous weeks.
Sotoudeh won the European Parliament's prestigious Sakharov rights award in 2012 for her work on high-profile rights and political cases, including juveniles facing the death penalty in Iran. She has defended journalists and activists including Nobel Peace laureate Shirin Ebadi.