An FBI investigation that led to the resignation of CIA Director David Petraeus also turned up evidence that Gen. John Allen, the top U.S. commander in Afghanistan, was exchanging potentially inappropriate emails with a Florida woman involved in the scandal, Pentagon officials said.

Defense Secretary Leon Panetta said in a statement early Tuesday morning that he had ordered an investigation of Allen after the FBI informed the Pentagon it had uncovered thousands of pages of emails between Allen and Jill Kelley, a 37-year-old who has been described as an unpaid social liaison at MacDill Air Force Base, Fla., which is headquarters to the U.S. Central Command.

Kelley's complaints to the FBI that she had received anonymous e-mails warning her to stay away from Petraeus led the FBI to open an investigation that ultimately traced the e-mails to Paula Broadwell, Petraeus’s biographer, who was involved in an affair with Petraeus.

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