-- A U.S. official told CNN that many of the documents could be innocuous, involving routine business that Allen and Kelley were both involved in at U.S. Central Command, or CENTCOM. "In his duties at CENTCOM, Gen. Allen conducted a lot of legitimate business. She did a lot of work with CENTCOM, including Wounded Warriors and such," the official said. "It could be that 29,900 of the documents are legitimate business, and the few remaining raise a few eyebrows."

-- "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."

-- Kelley's brother, David Khawam, told CNN affiliate KYW-TV on November 12 that she is a dedicated mother and said it would be "completely uncharacteristic" for her to have an affair. He said that she reported the other e-mails -- the anonymous ones that the FBI allegedly linked to Broadwell -- because she was scared.

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 with knowledge of the messages. Among those believed to be referenced in the e-mails was Petraeus. Because parts of Petreaus' schedule were not public, the e-mails raised questions about whether the sender of the e-mails had access to his private schedule or other 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 at the time, that had not been vetted yet. The claim by Broadwell has since been discounted by administration officials. Broadwell's source for that previously unpublished information remains unclear, and there's no evidence so far that it came from Petraeus.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 Broadwell, who is an officer in the Army Reserve, did have some kind of security clearance and that there are no issues with Broadwell having unauthorized access to classified information.

-- "I do not know how she got that information," said Sen. Dianne Feinstein, D-California and chair of the Senate Intelligence Committee, referring to Broadwell's October speech. "We should find out."

-- Feinstein 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.

-- According to a congressional aide familiar with the matter, the House and Senate intelligence committees weren't informed that there was an FBI investigation into the situation until the day Petraeus resigned.

-- Petraeus was scheduled to testify before Congress on the Benghazi attack and the government's response to it, but because he resigned as CIA director, he won't testify 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. Rep. Peter King, R-New York, said elements of the general's story "don't add up." He called Petraeus "an absolutely essential witness, maybe more than anybody else."

-- 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.

-- President Barack 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.

-- Allen will retain his post as the commander of U.S. and allied forces in Afghanistan pending Senate confirmation of a successor, who was nominated in October, before news of the allegations broke, according to the Defense Department. That vote is due November 15, Senate officials said.