NATO declined to provide further details, in keeping with a policy of waiting for national authorities to release such information.

At least 44 NATO service members have been killed so far this month in Afghanistan — many in the south where a surge of U.S. troops in recent months has increased fighting.

Separately, NATO said an airstrike in the east killed more than five insurgents.

The strike was aimed at an insurgent leader in Khost province who had recently conducted attacks in the area and was traveling with fighters armed with heavy weapons and machine guns.

The alliance said that it could not confirm if the targeted leader had been killed.

The alliance previously said the strike killed people other than insurgents, but then corrected its statement saying that no civilians were killed.