"As you saw earlier this week, the city conducts extensive public safety planning and training around major events, in close coordination with our law enforcement partners, to ensure public safety", a statement from Chicago Police Department obtained by Xinhua said.
His motive still remains unknown.
The reserved hotel rooms overlooked the festival's main stage, entrance, and exit - not vastly different than the positioning of the Mandalay Bay suite he eventually used to attack innocent Route 91 festival goers.
Clark County Undersheriff Kevin McMahill said Friday at a news conference that examinations of Paddock's politics, finances, any possible radicalization and his social behavior have turned up little information on what led to the attack. From the first shots that rang out, it took officers 75 minutes to find Paddock dead in his room.
Marilou Danley was questioned by federal agents on Wednesday after returning from her native Philippines.
After photos emerged of Paddock's room, speculation abounded about a small piece of paper seen lying on a table in the room and whether it contained an explanation for the massacre. One high roller told Weinreich that she thought Paddock was creepy.
"I knew Stephen Paddock as a kind, caring, quiet man", Danley said.
Las Vegas Sheriff Joe Lombardo has raised the possibility that Paddock may not have been working alone in executing America's worst modern-day shooting spree.
"You've got to make the assumption he had to have some help at some point", Lombardo added.
The police believe Paddock acted alone.
The 62-year-old grandmother reportedly claimed that Paddock had surprised her with a cheap air ticket a fortnight prior to the attack, to fly to the Philippines and visit her family, and had also wired her about $US100,000 to buy a house.