New details on Las Vegas shooting timeline

Investigators gave more details of the chronology of events around the shooting and pushed back against criticism that they were changing their story.
2:19 | 10/14/17

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Transcript for New details on Las Vegas shooting timeline
We move to the new information coming out about that shooting in Las Vegas. We're learning about a terrifying new target for the gunman as well as the time line for the deadliest mass shooting in America. Erielle reshef has more. Reporter: A visibly shaken Las Vegas sheriff revealing a new time line nearly two weeks after the deadliest mass shooting in modern American history. My intent is to provide some clarification on some outstanding issues out there in the public forum. Reporter: Correcting information given earlier this week saying hotel security officer Jesus campos was shot styx minutes before Stephen paddock began his initial assault. The hotel's parent company disputing this time gap. I am very well aware of the mgm statement provided yesterday. I agree with their statement. Reporter: Now Las Vegas authorities agreeing at 10 O 05:00 P.M. He shot campos and seconds later unleashed his hail of gunfire on the crowd below. He attempted to relay that via his radio and it was confirmed because he also relayed that information via his cell phone. Reporter: For ten minutes between 10:05 and 10:15 hundreds of bullets raining down on unsuspecting concertgoers. By 10:17 officers arrived on the 32nd floor determining the shooting had ceased. And the sheriff with another stunning disclosure during those ten minutes of terror the suspect turning his fire on these fuel tanks at nearby Mccarron airport and deliberately targeting first responders as they rushed to the scene. Raw emotion as the sheriff spoke of their heroism and of officer Brady cook. Brady sustained a substantial wound to his shoulder, through his bicep, into his chest and out his back. And the reason why I bring this one up, he asked me if he could go back to work today. So many heroes that night, 58 people died in that attack. The sheriff says 45 are still in the hospital. Some of them in critical condition. The FBI so far has found no ties between the gunman and any extremist groups. Till no clear motive but investigators do believe he acted alone. Can you imagine if he had been able to hit those gas tanks. It could have been catastrophic. R8, thank you very much.

This transcript has been automatically generated and may not be 100% accurate.

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