One soldier has been reportedly killed in an incident where an Afghan troop opened fire on US-led forces in eastern Afghanistan.
The incident took place on Sunday, leaving several others injured.
North Atlantic Treaty Organization (NATO) has also confirmed the attack without releasing details on the identity of the foreign soldier.
The exact location of the incident however has not been made clear.
The attack comes a day after eight people were killed in a rocket attack in the eastern province of Nuristan.
On September 26, an Afghan soldier killed a US soldier at a military base in the province of Paktia in another case of green-on-blue attacks.
The term green-on-blue comes from a color coding system used by the US army to refer to Afghan and foreign forces.
There was a hike in such assaults – also called insider attacks – in 2012, as a result of which NATO restricted its joint operations with Afghan forces amid fears of more such attacks.
The US and its allies invaded Afghanistan in 2001 as part of Washington’s so-called war on terror. The offensive removed the Taliban from power, but the country is still gripped by insecurity.
The increasing number of military casualties in Afghanistan has caused widespread anger in the US and other NATO member states, undermining public support for the Afghan war.