A NATO official says another Afghan policeman has turned his weapon on American allies in Afghanistan, killing two U.S. service members.
Friday's killing in the country's west is the sixth similar incident in two weeks.
Jamie Graybeal, a spokesman for the international coalition force, says the shooting happened in the far western province of Farah. He says the attacker was a member of the Afghan Local Police, a village defense force that is being trained by international forces, including U.S. special forces.
Graybeal says two American service members died before the Afghan attacker was shot and killed.
Attacks by Afghan allies on international troops have accelerated this year, killing at least 36 foreign troops and raising questions about the strategy to train Afghans to take over security in 2014.