Afghan police backed by U.S. troops killed three Taliban fighters and captured three more in a 40-minute gun battle in southern Afghanistan on Saturday, a Reuters witness said. The fire fight erupted after some 40 Afghan police officers, backed by a small team of U.S. mentors entered a village in the Shajoy district of Zabul province. Taliban fighters fired on the troops before retreating to a nearby hill on motorcycles. The police and U.S. mentors chased the militants and surrounded them. At the end of the battle, three Taliban were killed and three were captured, one of them wounded.