Investigators are still trying to pin down Stephen Paddock's motive for opening fire on thousands of country music fans in Las Vegas, killing 58 people and wounding almost 500 in the worst mass shooting in modern United States history. Many are traumatized and mourning the loss of a co- worker, 21-year-old Erick Silva, who was among the 58 people killed.
"When we are trained on active shooter situations, we look for a younger male, dressed in military-type garb, that's moving through a crowd", said Sgt Bitsko.
Campos was shot while investigating an alarm that was unrelated to Paddock's room.
It was revealed that the officers were not specialist "Swat" (special weapons and tactics) response, but ordinary Las Vegas police officers responding to police radio chatter about the shooting.
McMahill said investigators remained certain Paddock acted alone in the shooting.
But on Monday, the timeline changed.
Paddock had a document in the room with him that contained numbers, Sheriff Lombardo said, adding he could not immediately say what goal the figures served.
"We still do not have a clear motive or reason why", Clark County Undersheriff Kevin McMahill said.
"Every piece of information we get is one more piece of the puzzle in this case", Lombardo said.
He killed himself as police closed in.
With the hall silent, they - and Campos, who was injured but wanted to help - were free to evacuate the rest of the rooms leading up to Paddock, he said.
Those seeking to know the motive of Las Vegas gunman Stephen Paddock have had little more to chase than hints and shadows.
Unlike so many other perpetrators of deadly mass shootings before him, Paddock left behind no suicide note, no manifesto, no recordings and no messages on social media pointing to his intent, according to police.
Recalling the terrible night, Joseph Lombardo, Sheriff of the Las Vegas Metropolitan Police Department said Paddock was firing into a crowd of 22,000 concert-goers using powerful guns.
He then turned his gun on the 22,000 revelers at the Route 91 Harvest country music festival five minutes later, per the original timeline of 10:05pm, Lombardo said. "So he had had that written down and figured out so he would know where to shoot to hit his targets from there".
"What I can not confirm to you today, and what we continue to investigate is, whether anybody else may have known about this incident before he carried it out", McMahill said.
The sheriff also confirmed investigators are talking with Paddock's brother Eric Paddock, who traveled to Las Vegas, and continue to speak with the shooter's girlfriend, Marilou Danley, to get insight.
They also discovered several phones, laptops and tools in the "eerie" room.
"It never occurred to me in any way whatsoever that he was planning violence against anyone", Danley said in the statement. A lot of these ports are said to have been in Europe and the Middle East - mostly Spain, Italy, Greece, and the UAE, reported CNN.
Danley said that Paddock "never said anything to me, or took any action I was aware of, that I ever understood to be a warning that something disgusting like this was going to happen", according to the Los Angeles Times.
That drill work was not finished, Lombardo said.
"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was gonna be for the crowd", Newton said.
"Sometimes there isn't an understandable explanation for why someone commits a horrific crime", Mr Gomez said.
Paddock also reportedly tried to purchase tracer rounds at a gun show in the Phoenix area in recent weeks, but the vendor did not have any to sell, a law enforcement official briefed on the investigation told CNN.