WHAT WE KNOW ABOUT THE DEADLIEST MASS SHOOTING IN US HISTORY:
Some of the 23 guns found in Paddock's room on the 32nd floor of the Mandalay Bay Hotel casino had scopes on them. He used 10 suitcases to tote them to his room.
Also found were two "bump stocks" - devices added to semi-automatic guns that mimic the rapid fire of fully automatic weapons, according to US officials.
A search of Paddock's home in a retirement community in Mesquite, Nevada, turned up 19 more guns, explosives and thousands of rounds of ammunition. A quantity of ammonium nitrate, a fertiliser that can be turned into explosives, was found in Paddock's car.
Those killed included teachers, real estate agents and business owners. And the nightmare is not over for the dozens of people who remain in a critical condition.
Some were injured from gunfire and some from a chaotic escape.
Hospital officials said on Tuesday at least 45 people, including two children, remained in a critical condition.
- People at the Route 91 Harvest Festival: 22,000
- Dead: 59
- Died in hospital: 19
- Injured: 527
- In a critical condition (as of Tuesday morning): 50
Stephen Paddock, 64, killed himself in his hotel room before authorities arrived. Law enforcement and family members have not been able to explain what motivated the multimillionaire, who made much of his money from real estate deals, to inflict so much carnage.
On the surface, the retired accountant did not seem like a typical mass murderer, said Clint Van Zandt, a former supervisor of the FBI's behavioural science unit. Paddock is much older than the typical shooter and was not known to be suffering from mental illness.
Public records offer no hint of financial distress or criminal history, though multiple people who knew him say he was a big gambler.
Concertgoer Anna Kupchyan credits a man she knows only as Zach for saving her life and about nine others when he herded them into an outdoor trailer serving as a rest room.
Kupchyan, a 27-year-old law student from Los Angeles, said bullets were raining down on the crowd as she and a horde of others began running in search of a way out of the outdoor venue.
The man, Zach, opened a door and ordered people inside and then joined them and shut the door, Kupchyan said.
PRESIDENT SPEAKS OUT
President Donald Trump called Paddock a "very, very sick individual".
Trump spoke to reporters on Tuesday as he departed for a trip to hurricane-ravaged Puerto Rico. He called the gunman "demented" and said "we're looking into him very seriously".
Asked about gun laws, the president said "we'll be talking about gun laws as time goes by".