The Las Vegas Strip dimmed its lights Sunday night for 11 minutes as the city honored the victims of last week's mass shooting, the largest in modern USA history.
MGM Resorts International spokeswoman Debra DeShong said the company believes "what is now being expressed may not be accurate".
The Las Vegas gunman who killed 58 people from his hotel room barricaded shut a stairwell door on the 32nd floor of the Mandalay Bay to keep officers at bay during his rampage.
Mandalay Bay staff did not call Las Vegas police until after Stephen Paddock had already begun firing on the concertgoers, according to "World News Tonight" on ABC.
That account differs dramatically from the one police gave last week when they said Paddock fired through the door of his room and injured the unarmed guard after shooting into the crowd. "We believe what is now being expressed may not be accurate".
Johnson says he wasn't aware of the devices until after the Las Vegas shooting.
"In coordination with the FBI's behavioural analysis unit, a comprehensive picture is being drawn as to the suspect's mental state and now we do not believe there is one particular event in the suspect's life for us to key on", Lombardo said. "Someone's firing a rifle on the 32nd floor down the hallway".
Paddock sprayed an outdoor concert with bursts of gunfire from high above in a Las Vegas hotel window on 1 October, killing 58 and wounding hundreds more, before shooting himself.
Nicole Rapp, whose mother was knocked to the ground and trampled at the country music concert said she's "having a hard time wrapping my head around" why police changed the timeline of the shooting. "It's traumatic for the victims and their families not to be sure of what happened". Therefore, it is not appropriate for us to comment further at this time on what remains an open matter for law enforcement.
It was unclear why Paddock stopped firing at the crowd, suggesting he may have initially planned to escape, Lombardo said. He added: "I don't think the hotel dropped the ball".