Iranian-American journalist Reza Valizadeh has recorded a voice memo from Iran's Evin Prison requesting medical help for himself and other American detainees, according to audio obtained by CBS News.

Valizadeh, who the U.S. government considers wrongfully detained, has been held at the facility for over a year. The recording was made possible when Iran partially lifted a nationwide internet blackout, allowing limited communication.

The journalist is among six Americans currently being held by Iran, according to U.S. officials. Evin Prison, located in Tehran, has been the subject of international scrutiny for its treatment of political prisoners and journalists.

In the voice memo, Valizadeh specifically pleaded for medical assistance not only for himself but also for other American captives detained at the facility. The recording provides a rare direct communication from inside the prison.

The case highlights ongoing tensions between the United States and Iran over detained American citizens. U.S. officials have previously called for the release of Americans they consider wrongfully imprisoned in Iran.