Hundreds of prisoners, including those arbitrarily detained, from Tehran’s Evin prison are being subjected to cruel and inhuman conditions. They were moved to overcrowded prisons after Israeli air strikes destroyed parts of Evin prison on 23 June. The Iranian authorities are concealing the fate or whereabouts of dozens of other prisoners, which may amount to enforced disappearance, a crime under international law. These prisoners are at risk of torture and other ill-treatment.