A new timeline for the Las Vegas massacre has been released, putting the shooting of hotel security guard Jesus Campos just after the slaughter began rather than just before - as cops previously claimed.

Digital experts working for The New York Times analyzed 30 videos from the murderous rampage on October 1 to piece together a chronology of events.

They determined that 64-year-old Stephen Paddock began firing at the Route 91 Harvest festival concertgoers at 10.05pm, starting out with single shots.

According to The Times, Mandalay Bay security guard Campos was shot a minute later - at 10.06pm - and not before the massacre began, as police had said earlier.

NEW YORK TIMES TIMELINE Digital experts working for the paper analyzed 30 videos from the murderous rampage on October 1 to piece together a chronology of events. Pictured: A man protecting a woman during the shooting 10pm: Country singer Jason Aldean is performing for a large crowd at the Route 91 Harvest festival in Las Vegas 10.05pm: Stephen Paddock begins firing his first rounds from the Mandalay Bay hotel, using single shots rather than automatic bursts 10.06pm: Security guard Jesus Campos is shot through the door of Paddock's hotel room after being spotted in the corridor outside his suite 10.06pm: Paddock fires his first and second automatic bursts into the crowd 10.07pm: Paddock fires his third and fourth automatic bursts into the crowd 10.09pm: Paddock fires his fifth burst 10.10pm: Paddock fires shots presumed to be indoors - possibly at Campos again 10.11pm: Paddock fires his sixth and seventh burst, the latter believed to be at cops 10.12pm: Paddock fires his eighth and ninth bursts 10.13pm: Paddock fires his tenth burst 10.14pm: Paddock fires his eleventh burst 10.15pm: Paddock fires his twelfth burst, and then stops shooting 10.22pm: Cops close in on Paddock's 32nd floor room 11.20pm: Cops break his hotel room door down and find him dead inside Advertisement

Senior story producer Malachy Brown told CBS: 'Ours isn't the definitive picture of what happened. More information will emerge, but it does give us new insights into what happened.'

But the rest of their timeline mostly matches what police have reported in their latest briefings.

The firing continues in a series of 12 bursts from 10.05pm until 10.15pm.

At 10.22pm, the firing stops and cops are outside Paddock's hotel room.

Jesus Campos, the Mandalay Bay security guard who was the Vegas gunman's first victim, sat down for his one and only interview with Ellen, which aired last Wednedsay

Paddock, a retired 64-year-old millionaire, wounded over 500 people when he rained a hail of bullets on crowds enjoying the Route 91 Harvest country music festival on October 1. Pictured: The room he used as a sniper's nest

According to The Times, Mandalay Bay security guard Campos was shot a minute after the massacre began - at 10.06pm - and not before the massacre began, as police had said earlier

The paper estimates Paddock (pictured) fired about 900 rounds during the massacre, which claimed 58 lives

Nearly an hour later - at 11.20pm - they break into his suite and find him dead on the floor.

They estimate Paddock fired about 900 rounds during the massacre, which claimed 58 lives.

Hundreds of others were wounded.

Browne, in a separate article about the timeline, explained how the study was produced: 'The process can be as simple as comparing a video with Google Street View to identify camera location or extracting file data with a smartphone app — or as difficult as analyzing each frame of a video and the amplitude and frequency of every second of audio.'