The shooting occurred in the Achin district of Nangarhar province, where U.S. special forces have been fighting alongside Afghan troops against Islamic State and Taliban militants, said Attaullah Khogyani, a spokesman for the Nangarhar provincial governor.
The Afghan soldier was killed in the incident, Khogyani said.
“The cause of the shooting is not clear. An investigation has already begun,” he said.
A Pentagon statement confirmed that three U.S. soldiers had been killed in eastern Afghanistan and one wounded soldier had been evacuated for medical treatment. The statement provided no further details of the incident but said it was under investigation.
One U.S. official, speaking on the condition of anonymity, confirmed that the incident was a “green-on-blue” attack by a member of the Afghan security forces in Nangarhar province.
So-called “green-on-blue” insider attacks by Afghan soldiers on international service members were a major problem several years ago, but now occur less frequently …
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