The alliance says three members of its force were killed Sunday in a vehicle accident in southern Afghanistan.
Another service member died the same day when a makeshift bomb exploded in southern Afghanistan.
And a fifth NATO service member was killed Sunday in an insurgent attack in eastern Afghanistan.
U.S. military spokesman Lt. Col. Joseph T. Breasseale said the three troops who died in the vehicle accident were American, as was the one killed in an attack in the east. The nationality of the fifth death was not immediately available.