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 USA history.
Paddock's life has remained somewhat of a mystery and most people who have interacted with him said nothing really stood out about him.
"Before we were trained to form a perimeter and hope for the best", Lombardo said.
They said they avoided getting close to hotel room windows in case they themselves were taken out by a sniper - because of the difficulties in communication between police officers.
FILE - In this Sunday, Oct. 1, 2017 file photo, police officers stand at the scene of a mass shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, in Las Vegas.
He added that investigators are also aware that the Islamic State (IS, formerly ISIS/ISIL) has claimed responsibility for the shooting, but said that they have found "no known nexus" to terrorism or connections to ISIS.
Used by Paddock, a bump stock's spring-loaded mechanism uses a rifle's recoil to repeatedly and rapidly pull the trigger, allowing the user to fire several hundred rounds per minute.
On Monday, Lombardo said security guard Jesus Campos was in a hallway of the Mandalay Bay hotel responding to a report of an open door when he heard drilling from Stephen Craig Paddock's room.
Charles "Sid" Heal, a retired Los Angeles County sheriff's commander and tactical expert, said the new timeline "changes the whole perspective of the shooting".
The small group of people who knew Paddock well said the one-time IRS agent and son of a notorious bank robber did essentially nothing except gamble, sleep and travel between casinos.
It has also been widely suspected that Paddock had been scouting out other locations near open-air concerts in the weeks before the Las Vegas attack.
And now that 64-year-old Stephen Paddock is also the gunman responsible for the worst mass shooting in modern USA history, the question is whether any of that has anything to do with the horrific thing that has made him infamous.
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Eleven people were hurt in the collision although none of their injuries are believed to be life threatening or life changing. Mark added: 'I think everyone seems to be just trying to carry on as normal because no one knows what is happening'.
Police said Paddock had killed himself. "And then you have the flashing lights", Newton said.
"We want to figure out the why to this, and we'd like to know the motive", Lombardo said.
His 64-year-old brother killed 58 people and injured 489 others at the Route 91 Harvest country music festival on October 1 by firing high-powered rifles from his high-rise hotel room at Mandalay Bay across the street. Investigators have found 200 incidents of Paddock moving through the city, and at no time was he with anyone else, Lombardo said.
Paddock's testimony offers little insight into what could have prompted last week's attack.
The officers discussed the lengths Paddock went to defend himself from police, and the contents of a note found inside his 32nd floor room.
Police have questioned Paddock's girlfriend, Marilou Danley, who has co-operated with police since she returned home from the Philippines earlier this week.
At the Cosmopolitan, he said he had opened a bottle of sake in his room, possibly on the night of the incident, but did not drink much.
"I thought. maybe it's something on top of the hotel", he said in an interview from Emporia, Kansas.
Federal Bureau of Investigation agents are piecing together Paddock's life in the weeks and months before the massacre, hoping to unearth an explanation.
"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was going to be for the crowd", Newton said in a clip from the the episode, which will be televised on Sunday night.
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