Outside of the Mandalay Bay Resort at 10:08 p.m. (1:08 a.m. ET Monday) in Las Vegas, rapid bursts of gunfire took the lives of 50 people, and injured more than 400 - making this massacre the deadliest in United States history. The shots were first heard at the Route 91 Harvest Festival, in the middle of country singer Jason Aldean’s concert. The festival attracted more than 300,000 attendees, and nearby hospitals are overwh...