(CNN) Florida Gov. Ron DeSantis revealed Tuesday that a second county in the state was hacked during the 2016 election.

Special counsel Robert Mueller's report on interference in the election said that "at least one" Florida county had been breached.

DeSantis, who was briefed by the FBI on Friday, said two counties "experienced intrusion into the supervisor of elections network," but added that there was no manipulation of the data, and that the intrusion "had no effect" on Florida vote totals. He did not say which counties were involved.

Previous reporting and government announcements have established that the GRU, Russian military intelligence, created an email phishing campaign aimed at Florida county election employees in the summer preceding the 2016 presidential election.

But it wasn't until Mueller's report was published that the public learned the FBI had investigated a particular county for actually being hacked.

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