The FBI investigation that led to the discovery of CIA Director David Petraeus’ extramarital affair and his resignation Friday started when the agency began monitoring Petraeus’ email, Fox News has learned.

The agency was alerted that biographer Paula Broadwell, with whom Petraeus had the affair, may have had access to his personal email account.

The investigation began when someone reported suspicious emails allegedly from Broadwell to the FBI. The agency then determined that she allegedly had emailed a number of government employees. The FBI was at one point trying to determine whether any of the employees were being stalked, sources told Fox News.

The FBI investigation started with a complaint several months ago about “harassing” e-mails from Broadwell to an unidentified third person, a government official briefed on the case told The New York Times on Saturday.

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