A classified State Department memorandum central to a federal leak investigation contained information about CIA officer Valerie Plame in a paragraph marked “(S)” for secret, a clear indication that any Bush administration official who read it should have been aware the information was classified, according to current and former government officials.

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The paragraph identifying her as the wife of former ambassador Joseph C. Wilson IV was clearly marked to show that it contained classified material at the “secret” level, two sources said. The CIA classifies as “secret” the names of officers whose identities are covert, according to former senior agency officials.