courtesy Creative Commons

A December investigation of the incident found that Pakistan fired first, but both sides were to blame for the strike.

The report found that Pakistanis fired from two border posts that were not on coalition maps. They continued to fire after American warned them they were shooting at allied troops, according to the NY Times.

Pakistan has rejected these conclusions and places the blame on U.S. forces.

A second inquiry was set up to decide if any American personnel should be punished. The review found that the Americans fired in self-defense and should not be punished.

“We found nothing criminally negligent on the part of any individual in our investigations of the incident,” a military official told The Daily Beast.

The decision is expected to anger Pakistani officials.