WASHINGTON -- A U.S. official says the Army has suspended the security clearance of the woman who had an affair with CIA Director David Petraeus, triggering his resignation.

Paula Broadwell, a West Point graduate, is a former Army intelligence officer and held a high security clearance. Because her clearance was issued through the Army, it was the service's move to suspend it.

It's not unusual for someone's clearance to be suspended if that person is under investigation, particularly in cases of possible security breaches. Officials say that an FBI investigation has revealed that Broadwell sent emails to another woman warning her to stay away from Petraeus. The FBI also found possibly classified documents on Broadwell's computer.

The official was not authorized to speak publicly about the clearance so requested anonymity.

In another development in the case, the military suspended the Air Force base pass of Tampa socialite Jill Kelley, whose complaints of email harassment led to the discovery of the affair.

Pentagon spokesman Lt. Col. Steven Warren says the decision to indefinitely suspend Jill Kelley's pass to MacDill Air Force Base was made in the last couple of days.

Kelley's complaints about threatening emails triggered the FBI investigation that led to the resignation of Petraeus and a probe into communications between her and the top U.S. commander in Afghanistan.

Warren said it was decided the pass suspension would be in the best interest of the Air Force base community. Kelley can still enter the base but now must report to the visitor center and sign in like everyone who doesn't have a pass.