Iran is top threat to U.S., military official says

>"The biggest threat to the United States and to our interests and to our friends, I might add, has come into focus and it's Iran," said the official, who spoke on condition of anonymity. Speaking at a forum in Washington, the official said he did not believe Iran wanted to provoke a conflict, however, and added he did not know if the Islamic state had decided to build a nuclear weapon.Next week, the International Atomic Energy Agency, the United Nations nuclear watchdog, is expected to release a report that includes evidence of Iranian nuclear research which makes little sense if not weapons related, Western diplomats said.(Reporting by Phil Stewart and Fredrik Dahl in Vienna.) Politics United Nations