A prominent Iranian documentary film-maker and women's rights activist, whose work includes banned films about Iran's society, has been arrested by unidentified officials. Mahnaz Mohammadi, 37, was picked up from her home in the capital Tehran by security officers who refused to show a warrant for her arrest and was taken to Evin prison, where many activists are being held. Speaking by phone from Tehran, her lawyer told the Guardian that Mohammadi had been denied access to her family or proper legal representation and was being kept incommunicado.