Las Vegas shooting medical responseEmergency services set up a makeshift medical centre in the middle of the Las Vegas Strip.Reuters

The deadliest shooting in recent US history unfolded — as most do — in a storm of chaos and confusion.

58 people were killed and more than 850 injured when a gunman opened fire at a country music festival on the Las Vegas Strip on October 1. 

By the time the general public knew a shooting was underway, the gunman, 64-year-old Stephen Paddock, was already dead.

Despite an extensive investigation lasting the best part of a year, authorities ended their efforts without being able to determine Paddock’s motivation.

Here, moment by moment, is how the attack unfolded: