At least one off-duty Las Vegas police officer was among those shot, Lombardo said. Several other off-duty police officers are believed to be among the dead and injured. ~ https://www.nbcnews.com/storyline/las-vegas-shooting/las-vegas-police-investigating-shooting-mandalay-bay-n806461
I keep seeing this.
Was the shooter deliberately aiming at the security on the ground for the concert?
that's a good question; was he on auto fire? did security run into the line of fire?
At that angle, I would think the crowd as a mass would be an easier target. It wouldn't make sense to hit the security, unless they were lined up and just took the first shots due to the distance. And then he would have adjusted.