Petraeus' biographer Paula Broadwell under FBI investigation over access to his email

The biographer for resigning CIA Director David Petraeus is under FBI investigation for improperly trying to access his email and possibly gaining access to classified information, law enforcement officials told NBC News on Friday.

Paula Broadwell is the author of Petraeus' biography, "All In." She had extensive access to Petraeus in Afghanistan and has given numerous television interviews speaking about him.

Petraeus resigned Friday, citing an extramarital affair. The woman involved was not identified.

The law enforcement officials said they do not believe the FBI investigation will result in any criminal charges. They also stressed that Petraeus is not under investigation.

The CIA declined all comment on the case. Broadwell could not be reached for comment.
Broadwell's Twitter account describes her as a national security analyst and Army veteran. (Continues)