even in dallas, they reported several shooters then changed the story latter, hata police ni watu, mis-understandings happen, at times assumptions have to be made, we are not dealing with all knowing all seeing aliens ni watu kama wewe na mimi, the same way you at times get a report wrong after handing the same over to your boss.
A guy with gun who barricades themselves in, especially if they happen to be trained and ready to die is a tough opponent.