NEW YORK — Pressure mounted Wednesday for Las Vegas police to explain how quickly they reacted to what would become the deadliest mass shooting in modern US history after two hotel employees reported a gunman spraying a hallway with bullets six minutes before he opened fire on a crowd at a musical performance.
On Monday, Clark County Sheriff Joe Lombardo revised the chronology of the shooting and said the gunman, Stephen Paddock, had shot a hotel security guard through the door of his suite and strafed a hallway of the Mandalay Bay hotel and casino with 200 rounds before he unleashed a barrage of bullets into the crowd.
That account differed dramatically from the one police gave last week when they said Paddock ended his hail of fire on the crowd in order to shoot through his door and wound the unarmed guard, Jesus Campos.
‘‘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.’’
Maintenance worker Stephen Schuck told NBC News he was checking out a report of a jammed fire door on the 32nd floor of Mandalay Bay when he heard gunshots and the hotel guard who had been shot in the leg peeked out from an alcove and told him to take cover.
‘‘It was kind of relentless so I called over the radio what was going on,’’ Schuck said. ‘‘As soon as the shooting stopped we made our way down the hallway and took cover again and then the shooting started again.’’
Campos also used his radio and possibly a hallway phone to call hotel dispatchers for help. It was unclear if and when the hotel relayed the reports of shots being fired to police.
Las Vegas authorities did not respond to questions about whether hotel security or anyone else in the hotel called 911 to report the gunfire.
‘‘Our officers got there as fast as they possibly could and they did what they were trained to do,’’ Las Vegas assistant sheriff Todd Fasulo said previously.
The parent company of the hotel has raised concerns that the revised timeline presented by police may be inaccurate.
‘‘We cannot be certain about the most recent timeline,’’ said Debra DeShong, a spokeswoman for MGM Resorts International. ‘‘We believe what is currently being expressed may not be accurate.’’
DeShong declined to comment on a lawsuit filed Tuesday by lawyers for Gasper against the company, concert promoter, gunman’s estate, and the manufacturer of the bump stocks used by the gunman to help mimic a fully automatic firearm.