Update: 1 killed in American University attack in Kabul

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An Afghan injured man lies on a stretcher in an ambulance near the site of an explosion that targeted the elite American University of Afghanistan in Kabul on August 24, 2016. Explosions and gunfire rang out as militants stormed the elite American University of Afghanistan in Kabul on August 24, 2016, prompting desperate calls for help from students trapped inside classrooms, in the latest attack in the Afghan capital. No group has so far claimed responsibility for the assault, which comes just weeks after two university professors -- an American and an Australian -- were kidnapped at gunpoint near the school. / AFP / WAKIL KOHSAR (Photo credit should read WAKIL KOHSAR/AFP/Getty Images)

One guard was killed and 21 students were injured Wednesday in an attack on the American University of Afghanistan in Kabul, said the head of Kabul Hospitals.

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