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A picture shows a burnt building at the US consulate compound in the eastern Libyan city of Benghazi on September 13, 2012 following an attack late on September 11 in which the US ambassador to Libya and three other US nationals were killed. Libya said it has made arrests and opened a probe into the attack, amid speculation that Al-Qaeda rather than a frenzied mob was to blame. AFP PHOTO/GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP/GettyImages)
A picture shows a burnt building at the US consulate compound in the eastern Libyan city of Benghazi on September 13, 2012 following an attack late on September 11 in which the US ambassador to Libya and three other US nationals were killed. Libya said it has made arrests and opened a probe into the attack, amid speculation that Al-Qaeda rather than a frenzied mob was to blame. AFP PHOTO/GIANLUIGI GUERCIA (Photo credit should read GIANLUIGI GUERCIA/AFP/GettyImages)

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    Source: Al Qaeda behind Benghazi attack

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Source: Al Qaeda behind Benghazi attack

U.S. officials confirm that al Qaeda was behind the September 11th Benghazi attack. Erin Burnett reports.

Source: Al Qaeda behind Benghazi attack

U.S. officials confirm that al Qaeda was behind the September 11th Benghazi attack. Erin Burnett reports.