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Afghans carry a wounded woman from the scene of an explosion in Herat, west of Kabul, Afghanistan, Wednesday, Aug. 15, 2012. Over a dozen people, including four women and a policeman, were injured when explosives set up on a bicycle exploded at a market in the city of Herat while people were shopping for an upcoming Muslim holiday, said Noor Khan Nekzad, a spokesman for the provincial police. (AP Photo/Hoshang Hashimi)

Afghan attack kills US troops

An Afghan soldier turned his gun on American troops

at a checkpoint in the country's east, killing two Americans and at

least two fellow members of Afghanistan's army in a shooting that marked

both the continuance of a disturbing trend of insider attacks and the 2,000th U.S. troop death in the long-running war. (AP)