An Afghan policeman kills 10 fellow officers , an official in Kabul Province says . Afghan Army says three soldiers killed in the shooting were U.S. Marines . The shooting occurs at a base shared by Afghan and American troops , the official says . `` We know they are trying to maximize media exposure of these events but our military believes that the operational impact has been negligible . Earlier in the day , a man in an Afghan security force uniform kills two U.S. soldiers .
An Afghan policeman kills 10 fellow officers , an official in Kabul Province says . Afghan Army says three soldiers killed in the shooting were U.S. Marines . The shooting occurs at a base shared by Afghan and American troops , the official says . Earlier in the day , a man in an Afghan security force uniform kills two U.S. soldiers .