Las Vegas gunman shot security guard before firing on concertgoers

Police have made a significant change to the timeline of the Las Vegas mass shooting, saying the gunman shot a hotel security guard before he opened fire on concertgoers.

Clark County Sheriff Joe Lombardo had previously said the guard was shot after gunman Stephen Paddock fired at the country music festival and that the guard's arrival in the hallway of the Mandalay Bay hotel may have caused Paddock to stop firing.