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Pakistani police officers stand next to wreckage of a damaged vehicle at the site of a roadside bomb blast that killed at least 15 people and wounded 12 others in northwest Pakistan near the Afghan border in the Jandol area of lower Dir, Pakistan on Sunday, Sept. 16, 2012. Officials said they did not know who set off the bomb, but such attacks are common in the country's remote tribal regions, where militants from both Pakistan and neighboring Afghanistan are active. (AP Photo/Rohullah Shakir)

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)