The US was aware of Pakistan's "duplicitous role" in the war on terror long before its top military commander Mike Mullen branded the dreaded Haqqani network of Taliban a "veritable arm" of ISI, a media report said on Tuesday.
A serious incident involving an ambush on American military officers by Pakistani troops in Teri Mangal on May 14, 2007, in which a US major was killed and three other officers were injured, was hushed-up by Washington, as relations between the two nations were viewed as too valuable to risk, 'The New York Times' reported.
The attack took place when some American military officers and Afghan officials had just finished a five-hour meeting with their Pakistani hosts in a village schoolhouse to settle a border dispute.
"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 report said.
The assault involved multiple gunmen, Pakistani intelligence agents and military officers, and an attempt to abduct or draw away the senior American and Afghan officials.
The 2007 attack was kept under wraps 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 report said.
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 US-Pak relations, which had often been restrained by Pakistan's strategic importance, the Times said.