It certainly looks like it might be a bullet strike, but I have seen rocks thrown by lawnmowers do similar damage. The story keeps alluding to multiple shots, but there doesn't seem to be any evidence of multiple strikes on the building. I don't think it was a structural failure brought on by previous damage, though. Some object struck the window. They need some physical evidence.
Our government... teaches the whole people by its example. If the government becomes the lawbreaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy. Louis D. Brandeis