Nika and Nava Kholousi are prisoners of conscience held in Vakilabad Prison of Mashhad.
Together, they are sentenced to 10 years and six months imprisonment for being of Bahaii faith.
The two sisters were arrested in March 2014.
In another development, it has become evident that Kajal Hosseini, a 38-year-old student of computer sciences at University of Tabriz, has been in detention of the Revolutionary Guards Intelligence for five months. Her family do not have information about her charges or conditions.