An Afghan policeman kills 10 fellow officers , an official in Nimruz province says . The Taliban claimed responsibility for the attack on a police station and said it was revenge for recent U.S. airstrikes against their fighters. The shooting occurs at a base shared by Afghan and NATO troops , the official says . Earlier in the day , a man in an Afghan security force uniform kills three U.S. soldiers .
An Afghan policeman kills 10 fellow officers , an official in Nimruz province says . Afghan official says three soldiers killed in Helmand province were U.S. Marines . The shooting occurs at a base shared by Afghan and NATO troops , the official says . Earlier in the day , a man in an Afghan security force uniform kills three U.S. soldiers .