U.S. Official: 'Multiple' Sources Strengthen Case Against Iran

Washington (CNN) -- "Multiple" sources have corroborated the report about an alleged plot to assassinate the Saudi ambassador to the United States, a scheme the administration is alleging is tied to Iran's military, a U.S. official told CNN Thursday.

When U.S. officials first learned of the alleged plot, "there were significant doubts there was any 'there' there," the official said. But "multiple sources of independently verified information" corroborated the account, the official said. "It coalesced into a picture of something unusual but serious," the official said.

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