This could easily be a digitally produced hoax, and the lack of any other videos or news stories about what would seem to have been a very prominent event would suggest that this is the case. Also, the video is abruptly cut off before the object does anything. Was this because the animator got tired of extending the image? It would seem that a person videotaping the real thing would have continued until it moved away, and not simply abandoned this incredible sighting right in the middle of the action. Making animations, on the other hand, is tedious, which is why most of the hoaxes we see end abruptly, usually in the middle of the action.
If the object is real, then it is an unknown, and one has to wonder what would happen if such objects appeared over not one city, but ten, a hundred, a thousand?