DUBAI (Reuters) -Gunfire broke out at a prison in Tehran holding political prisoners and dual-national detainees on Saturday, witnesses said, and smoke could be seen rising above the jail. State media quoted a security official blaming “criminal elements” for the unrest, which broke out after nearly a month of protests across Iran over the death in detention of Mahsa Amini, a 22-year-old Kurdish Iranian. The official said calm had returned, but one witness said gunfire could still be heard. “Roads leading to Evin prison have been closed to traffic. there are lots of ambulances here,” said a wi…