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.

The 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.

Elsewhere, a combined Afghan-NATO force discovered multiple drug caches in southern Kandahar province. NATO said the caches included 2.7 tons of marijuana and more than 1.5 tons of hashish.