WASHINGTON - U.S. commandos are hunting for secret nuclear and chemical weapons sites and other targets in Iran, and have a plan to turn the hard-line Islamic country into the next front in the war on terrorism. "It's not if we're going to do anything against Iran. They're doing it," an ex-intelligence official tells this week's issue of The New Yorker. Since at least last summer, the U.S. teams have penetrated eastern Iran, reportedly with Pakistan's help, the magazine said. "Iraq is just one campaign," the official told investigative reporter Seymour Hersh. "The Bush administration is looking at this as...