A security guard was killed and 21 students were injured Wednesday during an attack on American University of Afghanistan in Kabul, said the head of Kabul Hospitals. The attackers detonated explosives and fired guns when they invaded the campus, witnesses said, causing some students and faculty to flee. Others hid inside buildings while the insurgents remained on campus, a senior State Department official told CNN. A police operation was set to search for the attackers, said Interior Ministry spokesman Siddiq Siddiqui. As of early Thursday morning local time, it was unclear if the attackers had been found or whether people were still hiding in buildings. Read more http://www.cnn.com/2016/08/24/asia/kabul-afghanistan-american-university-blast-gunshots-heard/