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Caption: 	A Libyan demonstrator flashes the victory sign near the burning headquarters of the hardline Islamist group Ansar el-Sharia on September 21, 2012 in Benghazi, Libya. Hundreds of Libyan protesters forced members of a hardline Islamist militia out of their base in the second city of Benghazi late on September 21, setting fire to and wrecking the compound. Members of the Salafist jihadi group Ansar al-Sharia fired in the air before being forced out of their base by the demonstrators. AFP PHOTO/ ABDULLAH DOMAABDULLAH DOMA/AFP/GettyImages
Caption: 	A Libyan demonstrator flashes the victory sign near the burning headquarters of the hardline Islamist group Ansar el-Sharia on September 21, 2012 in Benghazi, Libya. Hundreds of Libyan protesters forced members of a hardline Islamist militia out of their base in the second city of Benghazi late on September 21, setting fire to and wrecking the compound. Members of the Salafist jihadi group Ansar al-Sharia fired in the air before being forced out of their base by the demonstrators. AFP PHOTO/ ABDULLAH DOMAABDULLAH DOMA/AFP/GettyImages

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CNN's Zain Verjee recaps the investigation into the attack on the U.S. Consulate in Benghazi on September 11, 2012.