Apparently, one of the 'victims' is the individual who brought the gun. It was an accidental discharge (I believe the media is simply using the wrong term; the odds there was a truly accidental discharge - a mechanical failure of the gun - is near zero, it's almost certainly a negligent discharge by an idiot) and they got it past security by hiding it in their obese fat folds.
If true I still don't really understand how one can be so obese that the large amount of steel in the slide and barrel plus the frame supporting pieces and ammunition do not trigger the detector. If I made $15 an hour to wand people I wouldn't want to explore their fat folds either, I guess.
https://www.msn.com/en-us/sports/mlb...rt/ar-AA1fX3W2