The American Commander conducted his own investigation and doesn't think anything was done wrong by his troops, the Iraqi ICDC Commander thinks the Americans killed the boy, the Iraqi family members believe that the Americans killed the boy. It's a big mess.
Now the US Army's Criminal Investigation Division is looking into the matter. They spent four hours with the survivor. I have a lot of faith that they'll get to the bottom of this to determine if the American soldiers killed the Iraqi (unlikely) or something else happened.