(CNN)Police on Monday said that Stephen Paddockshot a hotel security guard six minutes before he began shooting concertgoers from his hotel room at the Mandalay Bay Resort and Casino — a striking change from an earlier police timeline of events.
Authorities said last week that security guard Jesus Campos had approached Paddock’s room as the shooting was underway, diverting the gunman’s attention. Police had said that after Paddock shot at Campos through the door, the gunman didn’t fire any more shots into the crowd.
Clark County Sheriff Joseph Lombardo said Monday that Campos was shot in the leg on 9:59 p.m. on October 1. Campos had been investigating an alarm that went off in another room on the same floor, signaling that a door had been left open.
At 10:05 p.m., Paddock, 64, began firing into the crowd at the Route 91 Harvest Festival, authorities said. He continued firing for about nine to 11 minutes.
Paddock’s final shots were fired at 10:15 p.m., according to police. Authorities do not yet know what made him stop shooting, Lombardo said. By the time officers entered the room, Paddock was dead from a self-inflicted gunshot wound.
Lombardo said that the revised timeline is based on new information that emerged over the course of the ongoing investigation.
“As I have conveyed to you from the very beginning — and your zest for information and my zest to ensure the public’s safety, and the calming of their minds — is some things are going to change,” the sheriff said. “Now, they are minute changes.”
The initial police timeline said that the first two officers to respond arrived on Paddock’s floor at 10:17 p.m. A minute later, the security officer told police he had been shot and gave them the location of Paddock’s room.
Investigators are still piecing together evidence left behind in the hotel room and probing Paddock’s background to determine why the retired accountant committed the worst mass shooting in modern US history.