As many as 30 separate email accounts were included in messages on Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE’s private server that have been classified at the highest levels, according to a new report.

Fox News on Wednesday reported that one unnamed U.S. government official claimed that top Clinton aides such as Cheryl Mills, Huma Abedin, Jake Sullivan, Philippe Reines and Patrick Kennedy all took part in the seven email chains that the State Department announced last month were classified as “top secret.”

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At least a dozen separate email accounts sent or received some of the 22 highly classified messages, Fox News reported.

The revelation, which was highlighted by the Republican National Committee, is part of a slowly developing picture of how Clinton used her unusual email setup as secretary of State.

Unlike the more than 1,500 other Clinton emails that were classified at some level, the 22 top secret emails were not released to the public even in a redacted form.

The New York Times, citing other anonymous officials, has reported that that at least one of the emails contained “oblique” references to CIA operatives. Others reportedly discussed a Times article about drones in Pakistan and a North Korean ballistic missile test.

Clinton’s bespoke email setup has dogged her presidential campaign and continues to spark heated political rhetoric in Washington.

The FBI is currently investigating the server and whether classified information was secure, it confirmed to the State Department this week. Clinton’s critics have suggested that she and her top deputies — including Mills, Abedin and Sullivan — could face criminal indictments for mishandling classified information.