JACKSON, Miss. -- A Mississippi man is being held hostage in Iraq by insurgents who have threatened to kill and mutilate him if U.S. troops don't withdraw from Fallujah, relatives said Saturday. Thomas Hamill, 43, of Macon, was captured Friday during a convoy ambush, the latest in a series of kidnappings in Iraq. Family members said they learned of his capture later that day. "They've been showing him on the TV, and they don't think he's an American," said Vera Hamill, his grandmother. "I just wish somebody would tell them he is an American. "I got God, and I just...