Pakistani security officials gather outside the devastated Marriott Hotel in Islamabad on Sept. 21, 2008, following an overnight suicide bomb attack. The Pentagon announced Satuday that a recent airstrike had killed Qari Yasin, who was linked to the bombing. Aamir Qureshi/AFP/Getty Images hide caption

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Aamir Qureshi/AFP/Getty Images

Malala Yousafzai poses for photographs in New York. Yousafzai survived being shot by the Taliban in 2012 because she advocated education for girls. Frank Franklin II/AP hide caption

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Frank Franklin II/AP

An unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on Jan. 31, 2010. U.S. drone strikes killed at least 13 people in two separate strikes Wednesday and Thursday in Pakistan's tribal area. Kirsty Wigglesworth/AP hide caption

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Kirsty Wigglesworth/AP

Pakistani paramilitary troops carry a coffin Monday bearing a colleague killed Sunday during a battle with members of the Pakistani Taliban who stormed the Jinnah International Airport in Karachi. More than 20 people died Sunday. Fareed Khan/AP hide caption

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Fareed Khan/AP

Mullah Fazlullah was selected Thursday as head of the Pakistani Taliban. Nicknamed "Radio Mullah" for his fiery religious broadcasts, he's also blamed for the 2012 attack on Pakistani teenager Malala Yousafzai. Xinhua /Landov hide caption

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Xinhua /Landov