SAN FRANCISCO (AFP) - Authorities in Iran have detained an Iranian-born lecturer at a top US university on suspicion of espionage for at least three months, colleagues said Wednesday. Political scientist Dariush Zahedi, who lectures at the University of California, Berkeley, is being held in Tehran's Evin prison, his colleague Professor Edwin Epstein told AFP. Tehran-based news service Iran Emrouz reported that the academic and author was being held in solitary confinement on suspicion of espionage after returning home for a visit in June. "I learned about this from family associates in late July, but when exactly he was detained,...