Two Americans — a service member and a civilian — were killed in a attack near a coalition base in the Afghan capital Kabul on Wednesday, the U.S. military said, NBC News reported.
A U.S. service member and two American civilians were also wounded and in a stable condition, according to a statement by U.S. Forces-Afghanistan.
The attack was carried out by an "unknown assailant who was later killed," the statement said. It did not offer any more details about the nature of the attack.
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The Americans were conducting duties as part of NATO's wider mission to "train, advise and assist" the Afghan security forces in their ongoing fight against the Taliban and other groups.