Pakistani soldiers escort students as they leave the Army Public School in Peshawar on Jan. 12. The school has reopened after last month's attack by the Pakistani Taliban that killed more than 130, most of them teenage students. A Majeed/AFP/Getty hide caption

itoggle caption A Majeed/AFP/Getty

Pakistani Taliban patrol in their stronghold of Shawal in the Pakistani tribal region of South Waziristan, in 2012. The organization has reportedly split over disagreements about tactics. Ishtiaq Mahsud/AP hide caption

itoggle caption Ishtiaq Mahsud/AP

A levee protects a home surrounded by floodwater from the Yazoo River near Vicksburg, Mississippi on May 18, 2011. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images