Jill Kelley and Paula Broadwell, the two women at the center of the David Petraeus scandal, both visited the White House multiple times during the last four years. 

Kelley  has visited three times since September of this year, and Broadwell’s two visits were in 2009 and 2011,  a White House official told NBC News on Friday, speaking on condition of anonymity. 

Kelley’s trips were set up by a White House staffer she met at MacDill Air Force Base in Tampa, Fla., where she served as an unpaid social coordinator.

The staffer hosted Kelley and her twin sister, Natalie Khawam, for breakfast in the White House cafeteria, known as the mess, on Sept. 28 and again, for lunch, on Oct. 24. 

The third visit, on Sunday, Nov. 4, occurred just three days before Gen. Petraeus resigned as CIA director, citing an extramarital affair.  Kelley also took a tour of the White House that day with her husband, Scott, and their three children, as well as Khawam and her child. 

Broadwell visited the White House twice -- in June 2009, when she met with a National Security Staff member who handled Afghanistan and Pakistan policy, and in June 2011 when she attended a broad briefing on Afghanistan-Pakistan for approximately 20 guests, according to the White House official. 

The women have emerged as key figures in the scandal that cost Petraeus his job.

Numerous government and law enforcement officials have told NBC News that Kelley inadvertently triggered the investigation that revealed Petraeus' extramarital affair with Broadwell, his biographer, by complaining to an FBI agent she knew about a series of harassing emails she had received. Agents investigating the cyber-harassment case first determined that Broadwell was the author of the emails, then found evidence of her affair with Petraeus, the officials said.

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James Brantley

Multiple sources tell NBC News the woman with her back to the camera in the top photo is Paula Broadwell. She is pictured at a reception prior to the annual OSS Society awards dinner in Washington on Oct. 27, speaking to a man who is nearly obscured in the photo. The photographer and a senior U.S. intelligence official tell NBC News that the man is Gen. David Petraeus, also attended the event. The photo below, taken approximately a minute later, shows Petraeus speaking to one of the unidentified guests in the first photo.

Two weeks before his resignation as CIA Director, David Petraeus and his biographer, Paula Broadwell, met at an event honoring one of Petraeus' predecessors, NBC News has learned. It is the last known meeting between the two before the scandal that cost Petraeus his job went public and occurred after Broadwell had admitted to the FBI the two had an extramarital affair, according to multiple government and law enforcement officials. 

One senior U.S. intelligence official who attended the event – the annual Office of Strategic Services Society awards dinner -- tells NBC News that he saw the two speak to each other at the Oct. 27 event. The official did not know details of the conversation.

And photographer James Brantley, who worked the event, said he is certain the two spoke, based on the photos above, which he estimated were taken about a minute apart. The first shows Broadwell speaking to a man who is nearly obscured in the photo, as two unidentified guests look on. The second, taken from a different position, clearly shows Petraeus speaking to one of the other guests from the first photo.

The duo’s presence at the same event was first reported by the conservative weekly Human Events, which said they attended together. But numerous partygoers interviewed by NBC News disputed that.

Still, their public proximity raised eyebrows after the events of last week unfolded.

Said one former senior U.S. intelligence official who attended, “It’s mind-boggling that she could be so reckless as to show up at high-profile events like this, shortly after learning the FBI was investigating their affair.” 

Charles T. Plinck, director of the OSS Society, did not return phone calls seeking comment from NBC News.

Email to Gen. Allen among those Kelley gave to FBI

The event came more than a month after Broadwell was first interviewed by the FBI following discovery of compromising emails that ultimately led to Petraeus' resignation on Nov. 9.  Days after the event, the FBI would interview Petraeus for the first time and Broadwell for a second time. The event also occurred about four months after the two reportedly broke off their 10-month affair.

Slideshow: Petraeus case: Cast of characters

ISAF via Reuters file

Meet the people who have been pulled into the scandal that caused Gen. David Petraeus to resign.

Launch slideshow

The dinner is the annual award ceremony of the OSS Society, a group dedicated to honoring veterans of the Office of Strategic Services, the World War II predecessor to the Central Intelligence Agency. Petraeus, who sources described as being in a "great mood" that night, gave one of the speeches honoring former CIA director and Secretary of Defense Robert Gates, the recipient of this year's William Donovan Award, named for the director of the OSS.

The dinner is one of the intelligence community's most high-profile events. It attracts top U.S. and international intelligence officials, former directors of the CIA and other U.S. intelligence agencies.  In addition to Petraeus and Gates, others who attended included John Bennett, director of the CIA’s National Clandestine Service; William Webster, former head of both the CIA and FBI; Adm. Mike Mullen, former chairman of the Joint Chiefs of Staff, and Ambassador Hugh Montgomery, former director of the State Department's Bureau of Intelligence and Research.

Robert Windrem is a senior investigative producer with NBC News.

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At least one anonymous email sent to Gen. John Allen, commander of U.S. and NATO forces in Afghanistan, was among those turned over by Tampa, Fla., socialite Jill Kelley to the FBI in June, a senior law enforcement official and a source close to Kelley tell NBC News. Kelley’s complaint to an FBI agent with whom she was acquainted triggered the investigation that ultimately led to the resignation of CIA Director David Petraeus.

The law enforcement official, who spoke on condition of anonymity, said Wednesday that Kelley turned over fewer than a dozen emails to the FBI agent, including at least one that Allen had received and forwarded to her.  The emails were ultimately traced to Paula Broadwell, Petraeus’ biographer and the woman with whom he had an extramarital affair, multiple government and law enforcement officials have told NBC News.

The official said it is not clear who received email from Broadwell first -- Kelley or Allen – but a person close to Kelley told NBC News on Wednesday that Allen received the first email in mid-May. According to the source, who also spoke on condition of anonymity, the email sent from an account called "kellypatrol" said , in essence, “Beware of Jill Kelley. She's the kind of person who could ruin you.” It also referred to a meeting Kelley and her husband were planning in Washington with Allen, the source said.

Allen forwarded the e-mail to Kelley, thinking it was a joke from her. She replied that she hadn’t sent it, the source said.

The law enforcement official said Allen also forwarded the email to a “military authority” within the Department of Defense. The official did not specify which office or individual was notified.

Kelley herself began receiving similar emails in early June, the source close to her said, sent from four or five alias accounts. They contained words to the effect of, “What kind of person are you.” And passages directed to her husband, asked, in essence, “Do you know what your wife is up to?” the source said.

As reported previously by NBC News, Kelley took the emails – including at least one from Allen – to the FBI agent she knew because they made reference to meetings she had planned with both Allen and Petraeus, the source said. Kelley wondered why an anonymous e-mailer would know that kind of detail and became concerned that someone was cyberstalking her or hacking into her e-mails, the person said.

Federal officials confirmed Wednesday that the agent who first took the complaint from Kelley is Frederick Humphries, a counter-terrorism agent who worked on the millennium bomb plot case. His name was first revealed by the New York Times.

-- / AFP - Getty Images

Tampa, Fla., socialite Jill Kelley, left, inadvertently triggered the FBI investigation of CIA Director David Petraeus by turning over anonymous threatening emails -- including one sent to Gen. John Allen -- to the FBI.

A senior defense official, also speaking on condition of anonymity, confirmed that Allen had received an anonymous email “some time ago” warning him to be careful around Kelley. The official, who had not seen the email but was generally familiar with its contents, said the general forwarded it to “proper authorities” within the military.

“He did the right thing,” the official said.

The defense official confirmed that the email also was forwarded to Kelley and her husband, Scott, but said it was not certain that Allen was the one who sent it to them. Allen did send Kelley an email referencing the anonymous note he had received, the official said.

The source close to Kelley and several law enforcement officials tell NBC News that Broadwell used multiple anonymous accounts to send the emails to Kelley and Allen. She “covered her tracks” by sending them from cybercafés, the source said.

Slideshow: Petraeus case: Cast of characters

ISAF via Reuters file

Meet the people who have been pulled into the scandal that caused Gen. David Petraeus to resign.

Launch slideshow

Meanwhile, defense officials tell NBC News that while there is no evidence that Allen and Jill Kelley engaged in an extramarital affair, there was enough “inappropriate” language in emails they exchanged to warrant an investigation by the Pentagon’s inspector general.

According to one official, who like the others spoke on condition of anonymity, a small number of emails contained language that could be considered “inappropriate” or even “suggestive.” 

But even without those, an investigation of the email correspondence between Allen and Kelley was inevitable given the circumstances, the officials said.

“We had no idea what was going on,” one said. “The last thing we want is to be accused of a cover-up,” regarding the Allen emails. 

Courtney Kube and Mike Brunker of NBC News contributed to this report.

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A June 23, 2011, file photo shows Paula Broadwell, second from left, watching as Gen. David Petraeus and his wife, Holly Petraeus arrive for a Senate Select Intelligence Committee hearing on Petraeus' nomination to be director of the Central Intelligence Agency.

What began with David Petraeus’ surprise resignation as CIA director on Friday resulting from an extramarital affair has now spiraled into a complicated story of infidelity, intrigue and politics.

Petraeus’ admission of an extramarital affair quickly led to his biographer, Paula Broadwell, and an examination of her relationship with the decorated war hero. The length of the FBI’s investigation of “menacing” emails sent to Petraeus’ family friend Jill Kelley, and the timing of the announcement of his departure from the Obama administration fueled conspiracy theories. Then Gen. John Allen, Petraeus’ successor as military commander in Afghanistan, was embroiled in the scandal, accused by U.S. officials of sending “inappropriate” emails to Kelley.

To help you keep the facts straight, NBC News has compiled this timeline, based on reporting by NBC News and other published accounts:

Spring 2006 -- Paula Broadwell meets Gen. David Petraeus, when she introduces herself after he gave a speech at Harvard's Kennedy School, where Broadwell was working on a master's degree, the Wall Street Journal reported. 

October 2008 -- Petraeus takes over as head of U.S. Central Command, based at MacDill Air Force Base. While serving there, he reportedly meets Jill Kelley and her husband, Dr. Scott Kelley. She is described in various accounts as a volunteer “social liaison” between the community and the base.

2008 -- Broadwell begins her doctoral dissertation, "a case study of General Petraeus’ leadership," according to Rolling Stone magazine.  

June 2009 -- Broadwell and her husband, Scott, purchase a home in Charlotte, N.C., the Charlotte Observer reports. 

June 2010 -- Petraeus is named as replacement for Gen. Stanley McChrystal as the top commander in Afghanistan after the latter makes impolitic remarks to a Rolling Stone reporter. Broadwell decides to turn her dissertation into a book.  

July 2010-July 2011 – According to an online biography of Broadwell that was taken down after Petraeus’ resignation, she made multiple trips to Afghanistan during this period, where she “embedded with the general, his headquarters staff and his soldiers on the front lines of fighting across Afghanistan to chronicle the experiences of this American general as they are brought to bear in the terrible crucible of war.”  

Aug. 31, 2011 -- Petraeus retires from the U.S. Army, departs Afghanistan.

Sept. 6, 2011 -- Petraeus takes over as director of the CIA.

Early November 2011 – According to former Petraeus spokesman Steve Boylan, who had spoken to his former boss after his resignation, Petraeus' affair with  Broadwell began around this time, approximately two months after he took the CIA job.  

January 2012 – “All In, The Education of General David Petraeus,” by Paula Broadwell with Vernon Loeb is published by Penguin Press.

May 2012 – “Menacing” emails – five to 10 of them, according to the Wall Street Journal -- began arriving in Jill Kelley's inbox, NBC’s Michael Isikoff and Pete Williams report. 

Emails on 'comings and goings' of Petraeus, other military officials escalated FBI concerns

June 2012 – The FBI investigation begins. A source close to Kelley tells Isikoff that she took the emails, which she viewed as harassing or menacing, to the FBI. The source said the anonymous emails didn’t mention Petraeus by name, but subsequent emails – sent from multiple alias accounts -- contained references to the "comings and goings" of high-level military officials -- including events that were not on any public schedule. This raised the question as to whether somebody had access to sensitive -- and classified -- information about the CIA director. 

T.Ortega Gaines / Charlotte Observer via Reuters

Paula Broadwell is pictured before embarking on a national book tour to promote "All In," her biography of Gen. David Petraeus.

July 2012 – Approximate end of the affair between Broadwell and Petraeus, according to former Petraeus spokesman Steve Boylan, who  tells NBC’s Kristen Welker in early November that it ended “about four months ago.” 

Late  summer -- Attorney General Eric Holder is told that agents have discovered an email link between Petraeus and Broadwell, which included exchange of “explicit details of a sexual nature,” according to the Wall Street Journal. 

September – FBI agents interview Paula Broadwell for first time, NBC’s Pete Williams reports.

Oct. 27  -- House Majority Leader Eric Cantor speaks to an FBI agent who had worked on the Petraeus investigation, according to Cantor spokesman Doug Heye. The agent-- who had originally contacted Rep. Dave Reichert, a Republican from Washington -- raised concerns that "sensitive information" relating to Petraeus may have been "compromised," Heye said. The timing of the tip to Reichert is not clear.

Week of Oct. 29 – FBI agents interview Petraeus and Broadwell (for a second time), according to NBC’s Michael Isikoff.

Approximately Oct. 30-31 – Somewhere around this time frame, Petraeus traveled to Tripoli to conduct his own personal inquiry into Benghazi, according to author Bob Woodward, appearing on "Meet the Press" on Nov. 11. NBC’s Andrea Mitchell confirmed that Petraeus had recently traveled to Libya.

Oct. 31 – After conferring with his chief of staff, Steve Stombres, and Richard Cullen, a former attorney general of Virginia, Cantor had Stombres call the FBI chief of staff to relay the information he had received from the FBI agent, NBC News has reported.

Nov. 1 -- Cantor aide Steve Stombres is told by the FBI that it cannot confirm or deny an investigation, but the bureau official assured the leader's office it was acting to protect national security.

Nov. 2 – The FBI concludes its investigation, according to NBC News’ Michael Isikoff, citing senior U.S. law enforcement official; the  last FBI interviews with both Broadwell and Petraeus also took place this day, NBC’s  Pete Williams reports, citing federal officials.

Nov. 6 – Justice Department informs Director of National Intelligence James Clapper.

Nov. 7 – Clapper informs the White House.

Nov. 8 –  Petraeus calls White House Deputy Chief of Staff Thomas Donilon and asks to see the president, NBC’s Andrea Mitchell reports. The White House tells Obama of the FBI investigation of Petraeus and his admission of an extramarital affair.

Nov. 9 – Obama accepts Petraeus’ resignation; Senate and House leaders first learn of it from media calls. They then speak to Petraeus, but don’t hear directly from the president, Mitchell reported.

Nov. 11 – Jill Kelley and her husband, Scott, issue statement: "We and our family have been friends with Gen. Petraeus and his family for over five years. We respect his and his family's privacy and want the same for us and our three children."

Afghanistan military commander Gen. John Allen investigated for 'inappropriate' emails

Chuck Burton / AP

FBI agents carry boxes and a computer from the home of Paula Broadwell in Charlotte, N.C.

Nov. 12 – In a surprise statement during a trip to Australia, Defense Secretary Leon Panetta announces that U.S. General John Allen, who succeeded Petraeus as military commander in Afghanistan, is under investigation over allegations he exchanged “inappropriate” emails with Kelley, the woman who triggered the investigation of Petraeus. Meanwhile, FBI agents carry out a four-hour “consensual search” of Broadwell’s home in Charlotte, N.C., leaving with eight to 10 cardboard boxes.

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New in this version: FBI search Paula Broadwell's home Monday night; officials say the FBI agent who worked with Jill Kelley, the Tampa, Fla. woman who received anonymous emails from Broadwell, was dismissed from case because he became obsessed with Kelley.

Updated at 11:36 p.m. ET: “Menacing” anonymous emails that launched the FBI investigation which ultimately brought down CIA Director David Petraeus contained references to the “comings and goings” of high-level U.S. military officials, raising concerns that someone had improperly gained access to sensitive and classified information, a source close to the recipient tells NBC News.

The first email sent anonymously to Jill Kelley, the Tampa, Fla., woman who reported the threatening emails to the FBI, in May referred to Kelley socializing with other generals in the Tampa area and suggested it was inappropriate and should stop, according to the source close to Kelley, who spoke with NBC News on condition of anonymity.

After Kelley alerted the FBI, agents began pursuing it as a possible case of cyber harassment or stalking. "The thought was she was being followed," the source said.

The anonymous emails continued -- sent from multiple alias accounts -- and some later ones in the sequence contained references to Petraeus, though not by name, the source said.

What most alarmed Kelley and the FBI, the source said, were references to "the comings and goings" of high-level generals from the U.S. Central Command, which is based at MacDill Air Force Base in Tampa, and the U.S. Southern Command, as well as Petraeus -- including events that were not on any public schedule. This raised the question as to whether somebody had access to sensitive -- and classified -- information.

Moreover, the sender of the emails had "covered her tracks pretty well," the source said.

Multiple government and law enforcement officials have told NBC News that FBI agents traced the emails to Paula Broadwell, Petraeus’ biographer. In the course of the investigation, the agents also discovered emails between Petraeus and Broadwell that were indicative of an extramarital affair, they said.

The source close to Kelley said that she had never met Broadwell and had no idea who she was. The source also stressed that Kelley has been active in multiple social events in the Tampa area and is purely a social friend of the Petraeus family.

Meanwhile, it has come to light that the FBI agent contacted by Kelley about the emails she received from Broadwell was removed from the case. According to officials, the agent’s supervisors said he had become infatuated with Kelley and had sent her shirtless photos of himself.

The FBI remains involved in the case, however. On Monday evening, plain-clothed FBI agents arrived at Broadwell’s home in Dilworth, N.C. around 9 p.m. Monday night for what a senior law enforcement official called a “consensual search.” The official said the search is not a raid and “not a game changer.”

Rather, the official said that the FBI is being thorough as it finishes its investigation into Broadwell and whether she violated cyber-stalking or cyber-bullying laws.

The investigation of Petraeus has concluded. Law enforcement sources tell NBC News that Petraeus is not under investigation and that they don't expect their inquiry will result in criminal charges.

The search of Broadwell's home is not expected to yield information that would lead to charges against her, the official said. At the house, agents did not respond when reporters asked for their affiliation, although WCNC in Charlotte, N.C. confirmed they were with the FBI.

NBC News has been unable to reach Broadwell for comment.

The new information offers clues about how federal investigators could connect a handful of anonymous emails to Broadwell, a trained intelligence officer who spent years working with some of the most secretive agencies in the world.

Federal officials who spoke with NBC News on condition of anonymity on Monday said it took agents a while to figure out the source. They did that by finding out where the messages were sent from -- which cities, which Wi-Fi locations in hotels. That gave them names, which they then checked against guest lists from other cities and hotels, looking for common names. 

That led them to Broadwell, they said, noting that the pattern coincided with her travel to promote her book.

Finding the location from which the emails emanated would not have been difficult, experts say.

Some webmail services, including Yahoo and Microsoft's Outlook.com, send user IP addresses across the Web with every note, according to privacy researcher Chris Soghoian, a senior policy analyst at the American Civil Liberties Union. Those IP addresses can be used to track the physical location of a computer user connected to the Internet, sometimes without the help of an Internet service provider.

Broadwell had used a Yahoo account publicly in the past. If she used a new, fake Yahoo account for some of those anonymous emails, agents would have had an easy time gathering a list of IP addresses from the threatening emails Kelley provided to them. And even if she had used Gmail or another service that doesn't "leak" IP information, an FBI agent could have obtained such information by calling Google with a subpoena, the experts said.

Slideshow: Petraeus case: Cast of characters

ISAF via Reuters file

Meet the people who have been pulled into the scandal that caused Gen. David Petraeus to resign.

Launch slideshow

Once there was evidence to link Broadwell to the emails, agents would have had little trouble proving probable cause and getting a warrant under the provisions of the Stored Communications Act, which would allow them to access any emails sent or received during the prior 180 days. Agents could also have sought a wiretap order and monitored Broadwell’s email in real time, though wiretaps are more challenging to obtain, and there is no indication that agents took that step.

Soghoian said the successful cyberhunt for Broadwell shows anonymity is much harder to preserve than many Internet users realize.

"We see this again and again. We saw it with the Anonymous (hacker) arrests last year.  The lesson for the rest of us here us you have to go through a lot of steps to maintain anonymity, and you only have to screw up once," said Soghoian. "The FBI was able to pierce the veil of anonymity even for someone who's been trained. The government only has to get one clue. You have to be successful 100 percent of the time (when trying to hide)."

NBC News Justice correspondent Pete Williams contributed to this report.

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