WASHINGTON - Two hours after first being notified of an attack on the U.S. diplomatic mission in Benghazi, Libya, a government email to the White House, the State Department and the FBI said an Islamist group had claimed credit, according to a copy obtained by CNN.
An initial email was sent while the attack was still underway, and another that arrived two hours later -- sent from a State Department address to various government agencies including the executive office of the president -- identified Ansar al-Sharia as claiming responsibility for the attack on its Facebook page and on Twitter.
The group denied responsibility the next day.
However, the emails raise further questions about the seeming confusion on the part of the Obama administration to determine the nature of the September 11 attack that left U.S. Ambassador Christopher Stevens and three other Americans dead.
Two White House officials, speaking on condition of not being identified on Wednesday, said the government emails about the attack were not an intelligence assessment. They also noted that there was conflicting information about Ansar al-Sharia denying responsibility.
"They were a part of the many different reports we were receiving that day," one of the White House officials said of the emails. "There are always multiple and conflicting reports in the initial hours of an attack. That's why you have an investigation."
White House spokesman Jay Carney told reporters on Wednesday that the emails were part of a public flow of information immediately after the attack.
"There were emails about all sorts of information that was coming available in the aftermath of the attack," Carney said. "The e-mail you're referring to was an open-source, unclassified e-mail referring to an assertion made on a social media site that everyone in this room had access to and knew about instantaneously."
Carney added that "the whole point of an intelligence community and what they do is to assess strands of information and make judgments about what happened and who was responsible."
The day after the attack took place, President Barack Obama referred to it as an "act of terror."
But in the following days, Carney maintained there was no evidence suggesting the attack was "planned or imminent."
The administration also suggested that an anti-Muslim video produced in the United States likely fueled a spontaneous demonstration in Benghazi as it had in Cairo, where the U.S. Embassy also was attacked.
Secretary of State Hillary Clinton, State Department spokeswoman Victoria Nuland and Susan Rice, U.S. ambassador to the United Nations, all cited the video as a motivating factor in the attack.
On September 13 -- two days after the attack -- a senior U.S. official told CNN that the violence in Libya was not the work of "an innocent mob."
"The video or 9/11 made a handy excuse and could be fortuitous from their perspective, but this was a clearly planned military-type attack," the official said.
However, it wasn't until September 19 that Matthew Olsen, the nation's counterterrorism chief, told senators that it was a terrorist attack. The next day, Carney also said it was "self-evident that what happened in Benghazi was a terrorist attack."
The emails obtained by CNN provide additional insight into the Benghazi attack.
The first one, sent at 1:05 p.m. Arizona time, or 10:05 p.m. in Libya, described a diplomatic mission under attack.
"Approximately 20 armed people fired shots; explosions have been heard as well," the email said. Stevens and four other mission staff were in the compound safe haven, it added.
Less than an hour later, at 1:54 p.m. Arizona time, another email reported "firing at the U.S. Diplomatic Mission in Benghazi has stopped and the compound has been cleared." It said a search was underway for consulate personnel.
The final email, at 3:07 p.m. Arizona time, noted the claim of responsibility for the attack. The subject line said: "Update 2: Ansar al-Sharia Claims Responsibility for Benghazi Attack."
"Embassy Tripoli reports the group claimed responsibility on Facebook and Twitter and has called for an attack on Embassy Tripoli," the e-mail said.
The Facebook claim of involvement was subsequently denied by the group at a news conference in the following days, but not very convincingly.
"We are saluting our people for this zeal in protecting their religion, to grant victory to the prophet," a spokesman for Ansar al-Sharia said at the time. "The response has to be firm."
Copyright 2012 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.
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