Iran's Revolutionary Guard threatens 'most-intense offensive operation' ever against US bases

Iran's paramilitary Revolutionary Guard threatened Sunday to launch its "most-intense offensive operation" ever after the killing of Supreme Leader Ayatollah Ali Khamenei.

"The most-intense offensive operation in the history of the armed forces of the Islamic Republic of Iran will begin in moments, targeting (Israel) and American terrorist bases," it said.

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Mourners raised a black flag over the Imam Reza shrine in Mashhad, Iran's second-largest city and a major pilgrimage site for Shiite Muslims.