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Colonel Mohammad Rasoul Zazai, an army spokesman, said the soldier had made a "mistake" and had not fired deliberately, reports the Guardian.
A coalition-run Twitter account said an Afghan soldier shot and wounded three American soldiers, without providing further details.
Most foreign combat troops withdrew from Afghanistan at the end of 2014, 13 years after they ousted the Taliban from power, but about 13,000 NATO-led soldiers remain to help advice and train Afghan forces fighting a revived Taliban insurgency.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)