Timeline of the Las Vegas attack

Police officers take cover near the scene of a shooting near the Mandalay Bay resort and casino. Photo: John Locher / AP

Las Vegas Sheriff Joseph Lombardo gave a step-by-step rundown Wednesday night of the response to Monday's shooting.

Key quote: "What we know is Steven Paddock is a man who spent decades acquiring weapons and ammo, and living a secret life much of which will never be fully understood... he meticulously planned the worst domestic attack in United States history."