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🧵 2/4: The detainees include businessmen Siamak Namazi and Emad Shargi, as well as environmentalist Morad Tahbaz. The fourth person's identity remains unknown.

🧵 3/4: The lawyer representing one of the detainees says the move is significant but warns there are no guarantees about what happens next.

🧵 4/4: The release of these four Americans would ease tensions between the US and Iran. However, issues like Iran's nuclear program and support for militias still divide the nations.

🧵 5/4: Last February, talks about a prisoner exchange and transfer of blocked Iranian funds were reported. This move may be related to those discussions.