Kenyans watch Monday as a plume of black smoke rises over the Westgate Mall, scene of a terrorist attack that left more than 60 dead. Kenya is a crossroads in East Africa, has many links to the West and has sent troops into Somalia. For all these reasons, the country was targeted by Somalia's al-Shabab militia group. Ben Curtis/AP hide caption

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A Yemeni soldier stands guard Tuesday near Sanaa International Airport. Mohammed Huwais /AFP/Getty Images hide caption

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This undated image from video, seized from the walled compound of al-Qaida leader Osama bin Laden in Abbottabad, Pakistan, and released by the U.S. Department of Defense on May 7, 2011, shows bin Laden watching President Obama on television. AP hide caption

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In this image from video, Mokhtar Belmokhtar claims responsibility for a deadly attack on a BP gas facility in Algeria. The Chadian military reported its forces had killed him in a raid in Mali on Saturday. Uncredited/SITE Intel Group/AP hide caption

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In this Wednesday, Feb. 20, 2013 photo, a young vendor waits for clients alongside woven reed mats of the type purchased by fleeing Islamists, apparently to camouflage their vehicles, in Timbuktu, Mali. Rukmini Callimachi/AP hide caption

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October 2011: Men stand on the rubble of a building destroyed by a U.S. drone strike in southeastern Yemen. Among those killed was U.S. citizen Abdulrahman al-Awlaki, the son of U.S.-born cleric Anwar al-Awlaki — who himself was killed by a drone strike the month before. Khaled Abdullah /Reuters /Landov hide caption

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Islamist militants raided the In Amenas natural gas field (pictured) in Algeria on Wednesday and took several hostages. BP/AP hide caption

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