NATO says one of its service members was killed Sunday, apparently by an Afghan army soldier.
The NATO statement said the incident took place in southern Afghanistan. It contained no information about the victim's nationality.
The incident appears to be the latest in a string of attacks by members of the Afghan security forces against coalition soldiers. Afghan and NATO troops often carry out joint operations against the Taliban insurgency.
Coalition forces are in the process of handing over security to local forces before the scheduled withdrawal of all international combat troops from Afghanistan by the end of 2014.
Also Sunday, the Afghan National Security Council met in Kabul to discuss long-term strategy for the sustainability of the Afghan National Army.
The presidential office issued a statement saying "the meeting focused on the system of training and education, as well as equipment and other means required to enable the force to independently handle the long-term protection and defense of the country, particularly after 2014."
The international coalition is in the second phase of handing security control over to Afghanistan's army and police, in a gradual process due to be completed by the end of 2014.
But most observers believe that without sustained international backing, deep divisions among various Afghan factions, including the Taliban, could return the country to a civil war-like situation similar to the one Afghanistan experienced after the withdrawal of Soviet forces in the 1990s.