E-mails: White House knew of terrorism claims in Benghazi attack but ignored them and later engaged in coverup

Dereliction of duty.

Washington (CNN) -- Two hours after the attack on the U.S. consulate in Benghazi, the White House, the State Department and the FBI were told that an Islamist group had claimed credit, government e-mails obtained by CNN show.

One of the e-mails -- sent from a State Department address to various government agencies -- specifically identifies Ansar al-Sharia as claiming responsibility for the attack on its Facebook page and on Twitter.

The e-mails raise further questions about the seeming confusion on the part of the Obama administration to determine the nature of the September attack and those who planned it.

The attack left U.S. Ambassador Christopher Stevens and three other Americans dead.

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