Afghan security forces inspect a suicide bombing attack on Aug. 10 near the main gate of Kabul's international airport. It was one of a series of recent attacks in the Afghan capital that have left at least 50 dead. Violence in Afghanistan has increased since U.S. combat troops pulled out last year. Massoud Hossaini/AP hide caption

itoggle caption Massoud Hossaini/AP

This photo provided by the U.S. Government, presented during a trial, shows a photo of Irek Hamidullin surrendering after being wounded by U.S. forces in Afghanistan on Nov. 29, 2009. AP hide caption

itoggle caption AP

John Sopko, special inspector general for Afghanistan reconstruction, testifies on Capitol Hill last June. In a letter released Thursday, Sopko says the U.S. may have been paying for "ghost schools, ghost students and ghost teachers" in Afghanistan. Charles Dharapak/AP hide caption

itoggle caption Charles Dharapak/AP

Fatima Haidari, second from the right, and her bike riding club caught the attention of Humans of Kabul — the Afghanistan version of the popular Humans of New York blog. David Fox/Courtesy of Humans of Kabul hide caption

itoggle caption David Fox/Courtesy of Humans of Kabul

A group of Afghan women are attempting to reach the 24,580-foot summit this summer. In mid-May, two of the climbers, along with two American chaperones, visited Afghanistan's highest mountain to see the terrain firsthand in preparation for the historic climb. Soraya Sarhaddi-Nelson/NPR hide caption

itoggle caption Soraya Sarhaddi-Nelson/NPR