In one of the most shocking developments to emerge in the week-and-a-half since Stephen Paddock killed 59 people and wounded more than 500 others during the worst mass shooting in US history, NBC is reporting that a maintenance worker said Wednesday he told hotel dispatchers to call police and report a gunman had opened fire with a rifle inside Mandalay Bay before Paddock began firing on the Harvest country music festival below.

Worker Stephen Schuck told NBC News that he was checking out a report of a jammed fire door on the 32nd floor of Mandalay Bay when he heard Paddock shoot security guard Jesus Campos in the leg. After the shooting, Campos peeked out from an alcove and told Schuck to take cover.

"As soon as I started to go to a door to my left the rounds started coming down the hallway," Schuck said. "I could feel them pass right behind my head. "It was kind of relentless so I called over the radio what was going on," he said.
"As soon as the shooting stopped we made our way down the hallway and took cover again and then the shooting started again."

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