U.S. offers $5 million for missing American, appeals to Iran

By Mark Hosenball and Doina Chiacu WASHINGTON (Reuters) - The United States offered $5 million on Monday for help in finding an American who disappeared in Iran eight years ago and appealed to Tehran to cooperate in the search for the former FBI agent, Robert Levinson. "We ask the Government of the Islamic Republic of Iran to work cooperatively with us on the investigation into Robert Levinson’s disappearance so we can ensure his safe return," Secretary of State John Kerry said in a