OK, let me be the first to say... WTF does the mayor need an invesitgation for? The chief screwed up. I’ll bet that won’t happen again. End of story.
The mayor just wants to get reelected, and starting an investigation over this just panders to the gun grabbers who are probably outraged that a policeman used and fired a gun, even if by accident.
Isn't it a common policy for any on-duty discharge of an officer's gun will be investtigated (however much needed) and a report submitted? This is going to be fun for the Chief, going forward, eh? Just procedure, probably