A British couple detained in Tehran's Evin prison has described their situation as "life-threatening" amid ongoing regional tensions involving Iran. Craig and Lindsay Foreman are among foreign nationals currently held in the facility.

At least four Americans are also believed to be detained in Iranian prisons, according to former detainees and U.S. officials. The concerns about prisoner safety have prompted discussions among former hostages and diplomatic officials about the deteriorating conditions.

Former Iranian detainees Siamak Namazi and Emad Shargi, both previously held at Evin prison, recently appeared on a CBS News program alongside Roger Carstens, formerly the U.S. Special Envoy for Hostage Affairs, to discuss the current situation facing detained Americans.

Evin prison, located in Tehran, has long been criticized by human rights organizations for its conditions and treatment of political prisoners. The facility has housed numerous foreign nationals over the years, often on charges that their home countries dispute.

The heightened concerns come as tensions in the Middle East region have escalated, though specific details about the nature of the threats facing current detainees were not immediately available from official sources.