Afghan attack kills US troops

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    FILE - In this Oct. 3, 2009 file photo, U.S. Marine squad leader Sgt. Matthew Duquette, left, of Warrenville, Ill., with Bravo Company, 1st Battalion 5th Marines walks with Afghan National Army Lt. Hussein, during in a joint patrol in Nawa district, Helmand province, southern Afghanistan. U.S. military officials have noted that Afghan security forces are dying in insider attacks along with foreign troops, but so far, the Afghan government has not provided statistics on the number killed. (AP Photo/Brennan Linsley, File)

    FILE - In this Oct. 3, 2009 file photo, U.S. Marine squad leader Sgt. Matthew Duquette, left, of Warrenville, Ill., with Bravo Company, 1st Battalion 5th Marines walks with Afghan National Army Lt. Hussein, during in a joint patrol in Nawa district, Helmand province, southern Afghanistan. U.S. military officials have noted that Afghan security forces are dying in insider attacks along with foreign troops, but so far, the Afghan government has not provided statistics on the number killed. (AP Photo/Brennan Linsley, File)

    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)