Watch this video from 3 mins in and you'll hear 3 separate gunshots being fired from a sniper rifle into the crowd. The crowd begin to rush out in panic the guy filming says "what the hell is going on?". Note this is BEFORE the song starts which leads into the hail of bullets being fired by Stephen Paddock. The crucial thing here is that there is a 4th sniper shot fired a millisecond before the automatic fire begins which indicates strongly that there are two shooters firing one with a sniper rifle and one with the automatic. First shots of Las Vegas Worst Mass Shooting in U.S. history