An Afghan guard has shot dead two Nato troops accompanying a reconstruction team convoy travelling in a northern province, police said.
Police chief General Mohammad Qasim Jangalbagh said the shooting took place in the Darah district of Panjshir province, about 62 miles north of the capital, Kabul.
Mr Jangalbagh said the gunman was a bodyguard working for the country's second highest-ranking intelligence official. He said the shooter stopped the convoy, engaged in an argument with Nato troops and opened fire.
Mr Jangalbagh said another Nato soldier fired back and killed the gunman.
Nato said it is investigating the incident and declined to offer additional information.