The already strained relations between the United States and Pakistan took a direct hit over the Thanksgiving weekend. A NATO air attack on military outposts in Northern Pakistan Saturday killed as many as 28 troops.

From Reuters:

Pakistan retaliated by shutting down vital NATO supply routes into Afghanistan, used for sending in just under a third of the alliance’s supplies.

The attack is the worst single incident of its kind since Pakistan uneasily allied itself with Washington in the days immediately following the September 11, 2001 attacks on U.S. targets.

Relations between the United States and Pakistan, its ally in the war on militancy, have been strained following the killing of al Qaeda leader Osama bin Laden by U.S. special forces in a raid on the Pakistani garrison town of Abbottabad in May, which Pakistan called a flagrant violation of sovereignty.

A spokesman for NATO-led troops in Afghanistan confirmed that NATO aircraft had been called in to support troops in the area and had probably killed some Pakistani soldiers.

“Close air support was called in, in the development of the tactical situation, and it is what highly likely caused the Pakistan casualties,” said General Carsten Jacobson, spokesman for the International Security Assistance Force (ISAF).

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