Lots of conflicting reports about secondary shooting.
In regards to people already speculating: There's a coupe things to note... most events are indoor in vegas due to weather usually being extremely hot/cold. So before we jump directly to who did it based on the type of event, keep in mind that an open-air event with this many people may have just been optimum for the shooters to do the most damage. This is also the down-time for Vegas, meaning less events are happening.
Nobody is actually stupid here. We all can count on our fingers the likely suspect outcomes. But I just wanted to make it clear that the event itself doesn't indicate a type of victim necessarily. It was simply a perfect culling field for anyone who had this type of plan.