The Fog of War

Why again are we there?

A joint U.S.-Afghan force clashed with Afghan troops manning a snow-covered outpost and called in an airstrike early Saturday, killing four Afghan soldiers, U.S. and Afghan officials said. Both sides called the clash a case of mistaken identity.

Afghanistan's Defense Ministry condemned the killings in the eastern Wardak province and demanded punishment for those responsible. NATO called the deaths "regrettable" and announced an investigation.

The deaths are likely to strain relations between NATO and Afghan forces at a time both are calling for a closer partnership in the fight against the Taliban.

Underscoring those tensions, an Afghan interpreter killed two U.S. service members Friday at a combat outpost elsewhere in Wardak province, a NATO official said.

A U.S. soldier then killed the interpreter, the official said, speaking on condition of anonymity because he wasn't authorized to release the information. It wasn't clear why the interpreter had opened fire on the Americans.