(CNN)Eleven days after a gunman opened fire into a crowd at a country music festival in Las Vegas, killing 58 and injuring hundreds, investigators are still searching for answers.
Federal and local agencies have worked around the clock collecting evidence, delving into the gunman’s life and interviewing those close to him — but the gunman’s motive and why he stopped shooting when he did remain a mystery.
Clark County Sheriff Joseph Lombardo asked the public for patience, saying authorities are trying to “draw the most accurate picture” of how the shooting unfolded.
“There’s more than 20,000 moving parts associated with this investigation and it takes time,” he told CNN affiliate KLAS on Wednesday.
Here’s what we still don’t know about the deadliest mass shooting in modern US history.
What happened in the six minutes after the hotel security guard was shot?
In a new timeline of events released Monday, police said that Paddock shot Jesus Campos, a hotel security guard, six minutes before the gunman began firing into the crowd at the Route 91 Harvest Festival from his 32nd floor room at the Mandalay Bay Resort and Casino.
Paddock opened fire on the crowd at around 10:05 p.m. and unleashed bullets on concertgoers for about 10 minutes. The police didn’t get to the 32nd floor until 10:17 p.m., and they didn’t breach the room until 11:20 p.m., after a SWAT team arrived with explosive charges, Lombardo said.
Lombardo said that Campos, upon being shot, immediately notified security of his situation, and his action helped identify the location of the suspect. In addition, Campos prevented a maintenance worker on the same floor from suffering injuries, the sheriff said.
Police did not know Campos was shot until they met him in the hallway of the 32nd floor after getting off the elevator, Lombardo said.
What exactly happened in the six minutes between Campos’ getting shot and the mass shooting on concertgoers? Who did the security guard alert, and what was their response? Why did it take officers 18 minutes from that point to reach the gunman’s floor?
In a statement Tuesday, MGM Resorts, which owns the Mandalay Bay, said: “We cannot be certain about the most recent timeline that has been communicated publicly, and we believe what is currently being expressed may not be accurate.”
Is the new timeline of events correct?
Lombardo told KLAS that the timeline could change again. “Nobody’s trying to be nefarious. Nobody’s trying to hide anything. What we want to do is draw the most accurate picture we can,” Lombardo said. “And I’m telling you right now, today, that that timeline might change again. … It’s human factor involved.”
A law enforcement source close to the investigation disputed the MGM statement. “Our timeline is pretty accurate with all the facts known,” the source said Tuesday.
Why did Paddock stop shooting after 10 minutes?
Police initially thought that Campos approached Paddock’s door after the massacre had begun, and that Campos distracted him from firing into the crowd. Authorities had said that, after firing several rounds through his hotel room door at the guard, Paddock didn’t fire any more shots out the window.
But with the disclosure that Campos was shot before Paddock began his rampage, it’s unclear why he stopped after shooting for ten minutes.
By the time SWAT officers used an explosive to breach the door to Paddock’s suite, they discovered him dead on the floor, apparently of a self-inflicted gunshot wound.