Two more NATO soldiers were killed in an explosion in southern Afghanistan on Saturday bringing to four the number of multination force casualties in a single day, the military alliance said on Sunday, Xinhua reported.
"Two International Security Assistance Force service members died following an improvised explosive device (IED) attack in southern Afghanistan yesterday," said a statement released here by NATO-led International Security Assistance Force (ISAF).
However, the statement did not release the nationalities of the victims, saying "It is ISAF policy to defer casualty identification procedures to the relevant national authorities."
Troops mainly from the United States, Britain, Canada and Australia have been stationed in the restive southern Afghan provinces within the framework of ISAF to fight Taliban militants.
Separately, another NATO service member was killed on Saturday morning when a helicopter of ISAF crashed in country's eastern Kapisa province while another soldier lost his life in an insurgent attack also in eastern Afghanistan on the same day.
More than 130 NATO soldiers have been killed in Afghanistan since beginning this year.