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Pashtoon Yar, 35, an Afghan disabled man welds at a metal shop in Jalalabad east of Kabul, Afghanistan, Thursday, Aug. 16, 2012. (AP Photo/Rahmat Gul)

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)