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NATO military vehicles leave the Camp Qargha, west of Kabul, Afghanistan, Tuesday, Aug. 5, 2014. A man dressed in an Afghan army uniform opened fire Tuesday on foreign troops at a military base, causing casualties, an Afghan military spokesman said. In a statement NATO said it was investigating an "incident" involving both Afghan and international troops at Camp Qargha, a base west of the capital, Kabul, which trains officers for the country's army. (AP Photo/Massoud Hossaini)
NATO military vehicles leave the Camp Qargha, west of Kabul, Afghanistan, Tuesday, Aug. 5, 2014. A man dressed in an Afghan army uniform opened fire Tuesday on foreign troops at a military base, causing casualties, an Afghan military spokesman said. In a statement NATO said it was investigating an "incident" involving both Afghan and international troops at Camp Qargha, a base west of the capital, Kabul, which trains officers for the country's army. (AP Photo/Massoud Hossaini)

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    U.S. general killed in Afghanistan

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U.S. general killed in Afghanistan

An attacker clad in an Afghan military uniform opened fire at a training facility in Kabul. CNN's Jim Sciutto reports.

U.S. general killed in Afghanistan

An attacker clad in an Afghan military uniform opened fire at a training facility in Kabul. CNN's Jim Sciutto reports.