(04-08) 18:15 PDT BERKELEY -- Iran appears to have hardened its position on three UC Berkeley graduates who have been held in the country since last summer, accusing them of having links to U.S. intelligence. The charge, made by Iran's intelligence minister in an interview on state television, elicited strong denials Thursday from the U.S. State Department and the families of the prisoners, who were arrested after hiking across the border from Iraq. It also struck experts as an orchestrated move in a high-stakes chess game between Iran and the United States over nuclear ambitions and other issues. Read more:...