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

itoggle caption 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

itoggle caption 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

itoggle caption Xinhua /Landov