Iran Leader Warns U.S. Against Attacking by NASSER KARIMI

Even as it threatened to ravage U.S. global interests, Iran sent its top nuclear official to Vienna, Austria, for talks with the U.N.'s nuclear watchdog agency ahead of a Friday Security Council deadline for Tehran to halt its uranium enrichment activities.

"The Americans should know that if they invade Iran, their interests around the world would be harmed," supreme leader Ayatollah Ali Khamenei told workers gathered ahead of May Day, the international workers' holiday, state television reported.