NATO and Afghan officials say at least five Afghan police officers were
wounded early Saturday, when NATO helicopters mistakenly fired on them.
NATO says its forces were responding to small arms fire from insurgents in Ghazni province, when two of its Apache helicopters fired on police by mistake.
The alliance says at least one Afghan police officer was in critical condition. Afghan officials confirmed the incident and said at least six police were wounded.
NATO says it is conducting an investigation.
The alliance says it is also investigating reports that two Afghan civilians were mistakenly killed in neighboring Uruzgan province Friday, while troops fired mortars at insurgents.
More than 100,000 foreign troops are fighting Afghanistan's growing Taliban insurgency. Violence this year has hit the worst level in Afghanistan since the Taliban was ousted in 2001.
Some information for this report was provided by AFP and Reuters.