Two NATO soldiers were killed and another injured when an Afghan security personnel opened fire on them in Panjshir province, northern Afghanistan on Saturday, deputy to provincial governor said.

A security officer from Afghan Intelligence Service opened fire on two NATO soldiers in the Darah district of Panjshir after having a quarrel with them, and two NATO soldiers were killed and another one was injured, Abdul Rahman Kabiri told Xinhua.

The security officer was also killed when NATO soldiers returned fire, Kabiri said, and the reasons are still unknown.

A total of 290 NATO soldiers were killed in the country since the beginning of this year.