Oct. 7, 2001: President George W. Bush poses for a photo in the Treaty Room of the White House after announcing airstrikes on on Afghanistan.

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In this image taken from video and released by SITE Intelligence Group, Anwar al-Awlaki speaks in a video message posted on radical websites in November, 2010. SITE Intelligence Group/AP hide caption

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Yemeni President Ali Abdullah Saleh in Riyadh on Sept. 19, 2011. AFP/Getty Images hide caption

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Fire broke out in Kabul's Inter-Continental Hotel on Tuesday during the attack. Massoud Hossaini /AFP/Getty Images hide caption

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