The Pentagon said Thursday the footage released by the U.S. military may not be a very clear picture of what happened in the Pakistan air strike that killed 11 of its soldiers, CNN reported.

The U.S. military declared that the released footage taken from a drone shows an attack carried out on a group of guerrilla fighters who were battling coalition troops along the Afghanistan-Pakistan border.

The military repeatedly noted in the comments on the footage that there were no military structures or outposts within the impact area. The seven guerrilla fighters were killed on a mountain ridge by precision-guided bombs.

However, a U.S. Air Force document shows that bombs were launched on buildings neat the border. According to Pentagon spokesman Bryan Whitman, it’s possible that another strike may have occurred outside the view of the drone's camera.

According to the Air Force's official summary of combat action, on that day a B-1 bomber and two F-15 fighter-bombers dropped laser- and satellite-guided bombs on militant fighters and on buildings near Asadabad.

The Pakistani military confirmed that its soldiers were killed at a Frontier Corps outpost near Gora Prai and that the outpost was bombed by air.

The attack was labeled as a "completely unprovoked and cowardly act," by the Pakistani government, which urged U.S. Ambassador Anne Patterson to protest the matter.