A bomb and a separate insurgent attack killed two NATO service members in southern Afghanistan, the alliance said on Monday.
It said one service member died Monday as a result of an attack and another was killed in a bombing on Sunday. NATO did not provide any details or nationalities.
The deaths raised the number of international troops killed in September to 26. A total of 431 members of the international military coalition have died so far this year.
Also Monday, President Hamid Karzai departed for New York to attend the United Nations General Assembly. His office said he will discuss developments in the war and seek more cooperation from the international community to bring peace to the country, which has been struggling with a decade-long insurgency. He is expected to meet with President Barack Obama and other world leaders during his visit.