A view of the ground floor at the unfinished Kabul Grand Hotel in Kabul, Afghanistan, as seen on Aug. 1. Special Inspector General for Afghanistan Reconstruction hide caption

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Special Inspector General for Afghanistan Reconstruction

Members of the Taliban militia ride in vehicles during Afghanistan's annual Independence Day parade in Kabul on Aug. 19, 2001. Afghanistan was largely cut off from the world during the Taliban's rule from 1996 to 2001. That changed dramatically after the Sept. 11 attacks. Saeed Khan/AFP/Getty Images hide caption

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Saeed Khan/AFP/Getty Images

Afghan security personnel patrol at the site of twin suicide bombings near the Defense Ministry in Kabul, Afghanistan, on Monday. Wakil Kohsar/AFP/Getty Images hide caption

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Wakil Kohsar/AFP/Getty Images

Afghan security forces rush to respond to an attack on the campus of American University of Kabul on Wednesday. "We are trying to assess the situation," President Mark English told The Associated Press. Rahmat Gul/AP hide caption

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Rahmat Gul/AP

An Afghan protester screams near the scene of a suicide attack that targeted crowds of minority Shiite Hazaras during a demonstration in Kabul on Saturday. Wakil Kohsar /AFP/Getty Images hide caption

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Wakil Kohsar /AFP/Getty Images

Afghan police inspect the site in in Kabul, Afghanistan, where a bus convoy was attacked on Thursday. The buses carrying police cadets were targeted as they were on their way from the neighboring Maidan Wardak province to Kabul. Anadolu Agency/Getty Images hide caption

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Anadolu Agency/Getty Images

On Wednesday, Afghan mourners offer funeral prayers for a victim killed in Tuesday's bomb blast in Kabul. The Taliban said it carried out the brazen assault near the defense ministry, which would mark the first major Taliban attack in the Afghan capital since the insurgents announced the start of this year's fighting season. Shah Marai/AFP/Getty Images hide caption

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Shah Marai/AFP/Getty Images