briefly and then the soldiers open fire with rifles. >> as the video continue, the audio suggests some of the victims are still alive. one soldier approaches the victims and shoots again. cnn has not been able to verify whether the video is of an actual' vent, or when and where it was shot. pakistan's military said it doesn't know wetter the video is real or a forgery, but has launched an investigation into the manner. a retired pakistani general said judging from the uniforms, weapons and posture of those involved the video could be authentic. >> most probably, we have to assume there is some level of credibility and go for it. and then do a thorough investigation. >> reporter: human rights groups have frequently accused