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KABUL: The American military says an Afghan policeman has killed a US service member in eastern Afghanistan. The military says in a statement that the officer opened fire and threw a hand grenade at a US patrol in Bermel District of the eastern Paktika province. The troops returned fire, killing the policemen. The American troops were returning to a base from a foot patrol at the time of the attack. The incident is the second in a month in which Afghan policemen have fired on US troops and raises suspicions of possible infiltration of the police force by the militants. The US military says it is investigating the attack.