The New York Times reports:

A group of American military officers and Afghan officials had just finished a five-hour meeting with their Pakistani hosts in a village schoolhouse settling a border dispute when they were ambushed — by the Pakistanis.

An American major was killed and three American officers were wounded, along with their Afghan interpreter, in what fresh accounts from the Afghan and American officers who were there reveal was a complex, calculated assault by a nominal ally. The Pakistanis opened fire on the Americans, who returned fire before escaping in a blood-soaked Black Hawk helicopter.

The attack, in Teri Mangal on May 14, 2007, was kept quiet by Washington, which for much of a decade has seemed to play down or ignore signals that Pakistan would pursue its own interests, or even sometimes behave as an enemy.

The reconstruction of the attack, which several officials suggested was revenge for Afghan or Pakistani deaths at American hands, takes on new relevance given the worsening rupture in relations between Washington and Islamabad, which has often been restrained by Pakistan’s strategic importance.