Mr Nouri arrived home on Sunday afternoon from the Evin prison in northern Tehran, a relative said.

BBC: Reformist prisoner released on leave

Mr Mortazavi was arrested earlier this month and held for two days in Tehran's Evin prison, before he was released, Iranian media said.

BBC: Saeed Mortazavi (file photo)

Esfandiari, director of the Middle East program at the Woodrow Wilson International Center for Scholars, had been jailed largely incommunicado at Tehran's Evin prison.

NPR: American Scholar Released from Iranian Jail

Roxana Saberi, 32, had been drinking water but eating no food in protest at her detention at Tehran's Evin prison, according to her father, Reza Saberi.

CNN: Imprisoned U.S. journalist ends hunger strike