An animal rights activist who was detained in Iran on December 4 has been released by authorities in Tehran.
Ali Tabarzadi was released during the weekend without being formally charged.
Authorities have not provided a reason for his arrest on December 4.
One of Tabarzadi's relatives told RFE/RL’s Radio Farda that he was interrogated about his activities as an animal rights activist.
Tabarzadi’s brother, Hossein Tabarzadi, said eight security agents searched the family's house in Tehran on December 4 and took away computers and other personal items.
Tabarzadi, the son of well-known political prisoner Heshmatollah Tabarzadi, was detained ahead of a rally planned to protest the mistreatment of animals.