Two Afghan men in army uniform turned their weapons on foreign soldiers in east Afghanistan on Wednesday, killing two, an Afghan official and the NATO-led coalition said, Reuters reported.
An Afghan interior ministry official said the shooting took place in Kapisa province, just north of the capital Kabul.
The NATO-led coalition confirmed two foreign soldiers had been shot dead but did not identify their nationalities.
It was the first "insider" attack this year. There were ten such incidents last year, resulting in the deaths of 15 members of the ISAF international security forces, according to a Reuters tally.
The attacks led the NATO-led force to briefly suspend all joint activities, a cornerstone of its mission in Afghanistan.