US troops killed four Afghan policemen and wounded another after mistaking them for militants during an operation in southern Afghanistan in which two Afghan soldiers died, officials said on Friday.
The incident happened on Thursday in Helmand province's Girishk district when US troops spotted a vehicle carrying five armed men approaching an area where they were in contact with militants, said US spokesman Lieutenant Colonel Jerry O'Hara.
He said the police officers had not been in the uniform of the Afghan National Police and the vehicle had tried to drive away quickly.
A senior police officer in Helmand, Haji Mohammad Rahim, said the friendly fire incident occurred after Taleban guerrillas attacked a convoy of US and Afghan troops in the same district, killing two Afghan soldiers.