The more questions that are answered regarding the Las Vegas mass murder, the more questions that are raised. On the face of it, it looks like the Mandalay Bay and the Las Vegas police are both running for cover, contradicting one another’s timelines to save themselves. One thing is certain, the story is changing hourly.

On Tuesday, we reported that the Vegas police had made some startling revelations that muddied the waters even more and left most of us with a WTF? expression.

Now, Change #457,983.

From ABC7

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Mandalay Bay hotel officials didn’t notify police about a shooting in a hallway inside the high-rise until after Stephen Paddock opened fire on the crowd at a country music festival outside, a federal official told The Associated Press on Thursday.

The disclosure means there may have been a delay of some six minutes in summoning police to the scene of what became the deadliest mass shooting in modern U.S. history.

The official was briefed by law enforcement but wasn’t authorized to discuss the matter publicly and spoke on condition of anonymity.

In the most recent chronology given by investigators, Paddock sprayed 200 rounds into the hallway on the 32nd floor Oct. 1, wounding an unarmed security guard in the leg, six minutes before he unleashed his barrage of bullets on the festival crowd. He killed 58 people and injured nearly 500.

Over the past few days, Las Vegas police and the Mandalay Bay’s corporate parent, MGM Resorts International, would not answer questions about whether the hotel notified police about the hallway shooting in the minutes before the massacre began.

MGM has said the chronology given by police is inaccurate.

MGM Resorts International released the following statement on Thursday:

Although we prefer not to comment on the details of the investigation, we are issuing this statement to correct some of the misinformation that has been reported. The 9:59 p.m. PDT time was derived from a Mandalay Bay report manually created after the fact without the benefit of information we now have. We are now confident that the time stated in this report is not accurate. We know that shots were being fired at the festival lot at the same time as, or within 40 seconds after, the time Jesus Campos first reported that shots were fired over the radio. Metro officers were together with armed Mandalay Bay security officers in the building when Campos first reported that shots were fired over the radio. These Metro officers and armed Mandalay Bay security officers immediately responded to the 32nd floor. We will continue to work with law enforcement as we have from the first moments of this tragedy as they work toward developing an accurate timeline.

“These people that were killed and injured deserve to have those six minutes to protect them,” said Chad Pinkerton, an attorney for Paige Gasper, a California college student who was shot under the arm in the attack. “We lost those six minutes.”

But Ron Hosko, a former FBI assistant director who has worked on SWAT teams, said the six minutes wouldn’t have been enough time for officers to stop the attack.

Investigators have yet to figure out what drove Paddock to mass murder.

The 64-year-old high-stakes gambler and real estate investor began his 10-minute attack on the crowd at 10:05 p.m., firing more than 1,000 rounds from his bashed-out windows, police said. Police didn’t arrive on the 32nd floor until 10:17 p.m., two minutes after he had stopped shooting.

The timeline given by police earlier this week differed dramatically from the one they gave last week: that Paddock shot through his door and wounded the guard, Jesus Campos, after he had opened fire on the crowd.

Also Thursday, a funeral was held for Erick Silva, a 21-year-old security guard at the festival who was shot in the head while helping people climb over a barricade to escape the gunfire. Dozens of fellow “yellow shirt” security guards were among the hundreds of mourners at the service, where Silva was hailed as a hero.

“We counted on him, and he didn’t let us down,” said his boss, Gina Argento.