The first wave of the deadliest mass shooting in U.S. history took place just after midnight on Saturday, leaving 59 people dead and more than 500 wounded, as hundreds of people streamed out of the Mandalay Bay hotel.
More than 20,000 people have since been evacuated from the city.
At least 10 people were killed in a shooting at the Mandalayan Bay casino in Las Vegas, as well as an attack on a nearby music festival in which a gunman opened fire on a crowd of concertgoers.
On Sunday, at least 20 people were dead and scores injured in an attack at a shopping mall in Chattanooga, Tennessee.
But the deadliest day of the year has been dominated by the first wave.
The Las Vegas massacre has left more than 400 dead, including the gunman.
The gunman, Stephen Paddock, opened fire from his 32nd-floor room at the MGM Grand hotel and casino in the wee hours of Saturday, killing himself and wounding more than 50 others.
Las Vegas is known for its nightlife and for its reputation as one of the country’s most expensive and safest cities.
It is the second-most popular destination for vacationers in the United States, behind New York City.
But as the country gears up for its spring break, many visitors are coming to Las Vegas because of its reputation for crime and the thrill of the nightlife.
Las Vegas has been on a high-profile murder spree in recent years, most recently in December when Stephen Paddock killed 59 people and wounded nearly 500 others at the Route 91 Harvest festival.
There were more than 1,000 shooting victims in 2017, according to FBI data.
While the Lasers may be on their way out, many Las Vegas residents are still trying to process the shock of what they have witnessed.
“I’m just kind of trying to sort of move forward, trying to figure out what happened,” said Jessica Blevins, a 27-year-old from Las Vegas who works as a financial consultant.
She has never been to a music festival before, but said she felt safe coming to a concert because of the mass shooting.
She was in the crowd of people at the music festival when Paddock opened fire, shooting from his suite at the nearby Mandalay Creek Hotel.
She said she saw the shooter grab the weapon, then go into a room and start shooting, hitting many more people before the door burst open and the gunman turned the gun on himself.
Blevins was at the concert when she heard gunfire, then realized she was in danger.
The next thing she knew, she was lying on the floor, with multiple bullet wounds to her leg and chest.
Her family members had been watching the concert from the balcony, and they rushed her to the hospital, where she was pronounced dead.
When the Lasernews.com news anchor asked Blevis how she felt, she said, “I was scared.
I was very scared.
My family and friends and I were really scared.”
The worst part, she added, was that the gunman was still alive and shooting.
“I didn’t really know what to do,” she said.
“It was like an eternity, like an hour and a half, and it was so horrible.”
In Las Vegas on Sunday, the city’s mayor, Carolyn Goodman, said the worst was over, and the city would begin rebuilding.
Goodman said the city had already begun its reconstruction, and there would be more mass evacuations Sunday night.
Authorities are searching for more than 300 people, many of whom are believed to have fled the hotel and were on their own.
Paddock used a car to get to the Mandalays, Goodman said.
He drove through the airport, past security checkpoints, then drove into the hotel.
He was later found dead in a hotel hallway, authorities said.
On Sunday night, a crowd gathered outside the Mandalaya hotel in Las Venegas.
They chanted and waved flags, some carrying the name of victims’ relatives.
At least 12 of the dead were killed by gunfire, Goodman added.
A large crowd gathered on the street outside the Las Veneces, and many people held up signs with phrases like “No justice, no peace,” and “Let Las Vegas rise.”
“We are here, we are united, we’re ready to move forward,” one sign read.
Others carried signs reading “No hate, no fear, we will never be afraid” and “Las Vegas rose.”
Hundreds of thousands of people are expected to gather in the city on Monday for the Las Vegas Celebration of Peace.