U.S. military officials say no U.S. troops will be disciplined in connection with a NATO airstrike in November that killed 24 Pakistani soldiers, sending relations between the two countries into a nose dive.

U.S. military authorities had already said that a review late last year established the U.S. troops had acted in an appropriate self-defense mode after being fired on by the Pakistani forces from posts not on coalition maps.

Pakistan rejected those conclusions.

The ties between U.S. and Pakistan have been worn thin by a series of events, including the November strike, as well as the shooting of two Pakistanis in Lahore by a CIA contractor and the covert Navy SEAL operation that killed al-Qaida leader Osama bin Laden in Abbottabad.