Children in a Lahore slum after heavy rains. The slum has a large population of Pashtuns who came from Pakistan's lawless tribal regions; many carry the polio virus with them. Jackie Northam/NPR hide caption

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Pakistan's Prime Minister Yousuf Raza Gilani as he arrived at court today in Islamabad. Aamir Qureshi /AFP/Getty Images hide caption

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Pakistani military and police officials cordoned off a street in Abbottabad near the compound where Osama Bin Laden was found and killed. (May 8, 2011, file photo.) Asif Hassan /AFP/Getty Images hide caption

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A still image from video released Saturday (May 7, 2011) by the US Department of Defense shows Osama bin Laden. AFP/Getty Images hide caption

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October 2009 file photo: U.S. Army Specialist Damyon Miller from the 3rd Platoon, Charlie Company, 1st Infantry Regiment, 5th Stryker Brigade Combat Team, 2nd Infantry Division, mans a machine gun mounted at the back of a Stryker vehicle as the large armored convoy patrols near the Afghanistan and Pakistan border. Romeo Gacad /AFP/Getty Images hide caption

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