NATO troops have clashed with their Afghan allies in a so-called "friendly fire" incident.
Four Afghan soldiers were killed and six wounded after the U.S. called in air strikes.
The NATO-led International Security Assistance Force (ISAF) said its troops had come under fire and called in air strikes, without realizing they were engaging Afghan security forces.
The clashes in Wardak Province came hours after an apparently disgruntled interpreter shot dead two U.S. soldiers at a nearby base.
NATO and Afghan officials have announced a joint probe into how their troops ended up fighting each other.
In a separate incident in nearby Ghazni Province, ISAF said its troops had shot dead two Afghan civilians and wounded a third when they failed to heed warnings to stop the vehicle in which they were travelling.
compiled from agency reports