What we know

Gen. David Petraeus, 60, resigned Friday, November 9, as head of the CIA and admitted having an affair. His mistress was later identified as his biographer, Paula Broadwell. The retired four-star general formerly oversaw coalition forces in Iraq as well as U.S. and NATO forces in Afghanistan. He and his wife, Holly, have been married 38 years and have two grown children. Paula Broadwell, 40, is a West Point graduate raising two children with her husband Scott in Charlotte, North Carolina. Her affair with CIA Director Davi d Petraeus led to his resignation. She got to know him while working on a Ph.D. dissertation about him. Alleged "jealous" e-mails she wrote anonymously to another woman, Jill Kelley, brought the affair to light, a government source told CNN. Jill Kelley, 37, allegedly received "jealous" e-mails from Paula Broadwell, which the FBI investigated, a government source told CNN. The probe brought the affair between Broadwell and CIA Director David Petraeus to light. Kelley and her husband, Scott, who live in Tampa, say they've been friends with the Petraeus family for more than five years. Kelley, an unpaid liaison at MacDill Air Force Base, is known in Washington's social circuit. Gen. John Allen, 58, U.S. commander in Afghanistan, is under investigation for allegedly sending inappropriate messages to Jill Kelley. He denies wrongdoing, according to a senior defense official. Kelley had complained about anonymous e-mails she received, which were found to be from Paula Broadwell. The FBI probe of those e-mails led to the discovery of Broadwell's affair with CIA Director David Petraeus. Holly Petraeus, 60, has been married for 38 years to retired Gen. David Petraeus, and has two children with him. In the wake of his admitted affair with 40-year-old Paula Broadwell, she has become the latest scorned wife caught up in a public scandal. Holly Petraeus has long carved out her own mission helping others, with a special focus on financial issues facing military families. Also in the mix is an FBI agent whom Jill Kelley approached about anonymous e-mails she had received. The agent had previously sent shirtless photos of himself to Kelley, a U.S. official told CNN. The agent, who has not been identified, passed on the information to others to investigate, the source said. The e-mails were determined to be from Paula Broadwell. David Petraeus resigned as CIA chief last week after an investigation revealed an affair The scandal also sparked a probe into whether Gen. John Allen sent inappropriate e-mails President: I've seen no evidence of a potentially damaging national security breach FBI, CIA officials are expected to brief House intelligence officials on the matter (CNN) -- Retired Army Gen. David Petraeus resigned from his CIA director post last week after an FBI investigation revealed he had an extramarital affair, an investigation that also prompted questions about whether his paramour had inappropriate access to classified information. The scandal also has sparked an investigation into whether Marine Corps Gen. John Allen, the top U.S. commander in Afghanistan, sent inappropriate messages to a different woman, leading President Obama to put Allen's nomination to become NATO's supreme allied chief on hold. The FBI uncovered the Petraeus affair while it investigated e-mails that his paramour, Paula Broadwell, allegedly sent to a Petraeus family friend, Jill Kelley, according to a U.S. official. Kelley, meanwhile, is the woman to whom Allen allegedly sent inappropriate e-mails, according to the Defense Department. Below is a summary of what we know about the situation. Timeline of the Petraeus affair New developments -- Obama said Wednesday that he has seen no evidence of a potentially damaging breach in national security stemming from the affair involving Petraeus. -- He also said Wednesday that Petraeus served his country with "great distinction," and he hoped that Petraeus' affair and resignation are "a single side note on what has otherwise been an extraordinary career." "By his own assessment, he did not meet the standards that he felt were necessary as director of the CIA with respect to his personal matter that he is dealing with. ... It was on that basis that he tendered his resignation, and it was on that basis that I accepted it," Obama said. -- A source familiar with Kelley's version of events said the anonymous e-mails later traced to Broadwell -- which led to the discovery of Petraeus' affair -- began in June. It wasn't until two months later that the FBI told Kelley who had sent the e-mails, said the source, adding that Kelley does not know Broadwell and has never met her. Previously, a U.S. official said the e-mails began in May. -- FBI and CIA officials on Wednesday are expected to brief the House Intelligence Committee's chairman and its top Democratic member on the resignation of Petraeus and the investigation that led up to it, according to a committee staffer. Opinion: 5 things we've learned from Petraeus scandal The Petraeus affair -- The FBI uncovered the affair between Petraeus, 60, and his biographer, Broadwell, 40, after Broadwell allegedly sent anonymous, harassing e-mails to Kelley in May, a U.S. official says. A senior official close to Allen says Allen received an anonymous e-mail about Kelley, and tipped Kelley off that someone was threatening her. -- Kelley, 37, says she and her husband are friends of Petraeus and his family. Media reports have described her as a liaison at MacDill Air Force Base in Tampa, Florida, where the U.S. Central Command is headquartered. Petraeus and Allen were previously stationed there. A Central Command spokesman said she is a volunteer with no official position. -- Investigators eventually traced the e-mails to Broadwell, a U.S. official said. The messages were along the lines of "stay away from my guy," but not explicitly threatening, according to a U.S. official. -- During the investigation, other communications surfaced between Petraeus and Broadwell, a married mother of two living in North Carolina, an officer in the U.S. Army Reserve and a Ph.D. candidate in the Department of War Studies at King's College London. CIA vs. FBI in Petraeus scandal -- Broadwell, a West Point graduate, had written a biography of Petraeus, published in January, called "All In: The Education of General David Petraeus." Having met Petraeus in 2006 when he spoke at Harvard, where she was a graduate student, she wrote the book after researching Petraeus for her Ph.D. dissertation on his leadership skills and visiting him and his team in Afghanistan, where he became top U.S. commander in 2010. -- Petraeus and Broadwell began their affair in the fall of 2011, a few months after he returned to the United States, retired from the Army and took over at the CIA, according to a Petraeus friend. They ended it in the summer of 2012, Petraeus' friend said. -- FBI investigators, following up on the anonymous e-mails to Kelley, discovered on Broadwell's computer e-mails that turned out to be from Petraeus, a U.S. official said. -- On Election Day, November 6, Petraeus told Director of National Intelligence James Clapper about the affair, according to a senior U.S. intelligence official. Clapper advised Petraeus to resign, the official said. -- On November 9, Petraeus quit the CIA, admitting to the affair. The House and Senate intelligence committees were informed of the FBI investigation the same day. -- Petraeus' resignation came just days before he was scheduled to testify before the Senate Intelligence Committee about the September 11 attack that killed four Americans at a U.S. diplomatic compound in Benghazi, Libya. Will national security scandal create national security risk? The Allen allegations -- The Defense Department's inspector general is investigating allegations that Allen sent inappropriate messages to Kelley, the department said on November 13. The FBI told the department about the allegations on November 11. -- Allen has denied wrongdoing, a senior defense official said. Sources familiar with Kelley have said the relationship between the two was not sexual. Authorities are looking at the e-mails. -- "There is no affair" between Allen and Kelley, a senior official close to Kelley said. "She is a bored rich socialite involved with every single senior commander at CENTCOM, because she worked as an honorary ambassador." Investigations and fallout -- Broadwell's affair with Petraeus has raised questions about whether the affair gave her access to national security information that she shouldn't have. The allegedly harassing e-mails that the FBI allegedly tracked to Broadwell detailed the "comings and goings of the generals and Ms. Kelley," according to a source. Among those believed to be referenced in the e-mails was Petraeus. Because parts of Petraeus' schedule were not public, the e-mails raised questions about whether the sender had access to sensitive information. -- In a speech at the University of Denver at the end of October, Broadwell suggested the attack on the U.S. compound in Benghazi took place because the United States was housing Libyan prisoners there -- a theory, she noted, that had not been vetted yet. The claim has since been discounted by administration officials. Broadwell's source for that previously unpublished information remains unclear, and there's no evidence that it came from Petraeus. -- A senior U.S. intelligence official said Broadwell did not have a security clearance from the CIA. Another official said that Broadwell, an Army Reserve officer, did have some kind of security clearance and that there are no issues with her having unauthorized access to classified information. No sex required for unfaithfulness to begin -- Sen. Dianne Feinstein, D-California and chairwoman of the Senate Intelligence Committee, said she would investigate why the FBI did not notify congressional oversight committees about its investigation into Petraeus after the bureau determined he was having a secret extramarital affair. -- Because Petraeus resigned as CIA director, he won't testify before Congress about the Benghazi attack as scheduled. Some Republicans have criticized the administration's response to the Benghazi attack and have speculated that the timing of Petraeus' departure was linked to the congressional inquiry. -- Feinstein said that she still hopes to bring Petraeus to testify about the Benghazi attack on November 16. -- While the nature of the relationship between Allen and Kelley, if any, is unclear, evidence of an affair could subject the general to military prosecution. Adultery is a violation of military law. -- Obama has put Allen's nomination to become NATO's supreme allied commander on hold pending the outcome of the investigation, White House spokesman Jay Carney said on November 13.