A man in an Afghan National Army uniform killed a NATO service member in southern Afghanistan, once again bringing a disturbing issue to center stage in the long Asian war - attacks by local security forces against coalition troops.

The incident took place Tuesday when the man "turned his weapon against an International Security Assistance Force service member," an ISAF statement said.

"Green on blue" - a euphemism for attacks by members of the Afghan security forces on their allies in the international force - are a mere fraction of the total coalition deaths in the war.

But  last month, an Afghan soldier killed four French troops, prompting French President Nicolas Sarkozy to suspend its training operations and combat help. In December, another Afghan soldier killed two French soldiers serving in an engineers' regiment.