10:46 p.m. ET: Newsweek writer Christal Hayes reports: "According to [Las Vegas] police radio transmissions, a group of officers was at the gunman’s door, and had locked down the 32nd floor, by about 10:25 p.m. but waited until about 11:21 p.m. — more than an hour after the attack began— before they blew open the door to enter, the recording shows." Read more here.
10:19 p.m. ET: Assistant Sheriff Todd Fasulo told reporters that death toll is still at 59 with 527 injured. He added that police found 23 firearms in the gunman's hotel room and another 19 in his house, totaling 42 firearms. Las Vegas Metro Police Department indicated that the motive for the shooting remains unknown and urged the community to be patient as authorities search through the gunman's homes and hotel room.
8:57 p.m. ET: Seth Moulton, a Democratic representative from Massachusetts, did not take part in a minute of silence to remember the victims of Las Vegas shooting because “now is a time for action,” Newsweek writer Harriet Sinclair reports. Read more here.
6:50 p.m. ET: Clark County Sheriff Joe Lombardo confirmed that ammonium nitrate, a component used in explosive devices, was found in Stephen Paddock’s car. Sixteen guns were found in the hotel room, in addition to the 18 retrieved from Paddock’s house in Mesquite, Nevada. Officials believe some of the weapons were altered, Lombardo said, adding that Paddock used multiple guns during the attack. Authorities also said the gunman carried the guns to his room in several suitcases. In total, 10 suitcases were found.
Lombardo went on to say police officials were concerned the gunman's hotel room was booby trapped. Officers waited for SWAT to enter the room.
6:13 p.m. ET: Clark County Sheriff Joe Lombardo told reporters that death toll has risen to 59 and 527 people have been injured. Lombardo said authorities found additional 18 firearms, several thousand rounds of ammunition and explosives in Stephen Paddock's house, located in Mesquite, Nevada. Officials are working on four separate scenes: the 32nd floor of the Mandalay Bay hotel, the Route 91 Harvest country music concert, the suspect's home in Reno and another of his properties in Mesquite. Lombardo added that more than 100 firefighters responded to the scene last night, trying to save concertgoers.
5:36 p.m. ET: A gun store owner in St. George, Utah—which is less than two hours from Las Vegas—told the Salt Lake Tribune he, too, had sold a weapon to Stephen Paddock. Chris Michel, of Dixie GunWorx, said Paddock bought a shotgun earlier this year. Read more here.
4:50 p.m. ET: The manager of Mesquite, Nevada-based Guns and Guitars Inc, which sold firearms to Stephen Paddock, released a statement following the attack. "We mourn for this tragedy and our thoughts and prayers are with the families of the lost and injured. Mr. Paddock was a customer and purchased firearms from our store; however, all necessary background checks and procedures were followed, as required by local, state, and federal laws," the statement, shared by CNN's Elizabeth Sanders on Twitter, said. "[Paddock] never gave any indication or reason to believe he was unstable or unfit at any time."
The statement concluded, "We are currently cooperating with the ongoing investigation by local and federal law enforcement in any way we can."
4:24 p.m. ET: The GoFundMe page to raise money for the victims of the Las Vegas shooting has raised more than $1 million in seven hours. The page originally sought to raise $1 million to provide relief and financial support to the victims and families of the shooting, but the goal now increased to $2 million. Nearly 11,000 people have donated to the efforts with local and national celebrities circulating the verified campaign.
Clark County Commission Chair Steve Sisolak set up the page and donated the first $10,000 for the campaign. He said on Twitter, "I'm overwhelmed by the outpouring of support from the Las Vegas community & beyond. We need more donations, every penny will be put to use."
4:00 p.m. ET: CNN political commentator Jake Tapper led his show, The Lead with Jake Tapper, with an apparent call to Congress to prevent future gun violence. "This is the second time in as many years that you're hearing me report about the deadliest mass shooting in modern US history," he said. "I wish I could tell you lawmakers are huddling right now to do everything they can to keep this from happening again, but I can't."
3:50 p.m. ET: Las Vegas residents are stepping up to help the victims of the deadliest mass shooting in modern US history, which killed 58 and left more than 500 injured. The country music festival had about 22,000 in attendance from across the U.S. and Canada.
The victims confirmed are 20-year-old Quinton Robbins of Nevada, Sonny Melton of Tennessee, 23-year-old Jordan McIldoon of Canada, Jessica Klymchuk of Canada, Lisa Romero of New Mexico, 35-year-old Adrian Murfitt of Alaska, 34-year-old Chuck Hartfield of Nevada, and Angie Gomez of California.
3:41 p.m. ET: The GoFundMe page to raise money for the victims of the Las Vegas shooting has raised more than $928,000 in six hours. The page originally sought to raise $1 million to provide relief and financial support to the victims and families of the shooting, but the goal now increased to $2 million. Over 9,000 people have donated to the efforts with local and national celebrities circulating the verified campaign.
3:32 p.m. ET: CBS has fired company lawyer, Hayley Geftman-Gold, for posting on Facebook that she had no sympathy for those injured or killed in the Las Vegas shooting because “country music fans often are Republican.”
The comments were eventually deleted, but screenshots circulated of the originals, which said, “If they wouldn’t do anything when children were murdered I have no hope that Repugs will ever do the right thing. I’m actually not even sympathetic bc country music fans often are Republican gun toters.”
Geftman-Gold was responding to a conversation regarding the Sandy Hook elementary school shooting and media coverage surrounding such mass shootings. Several individuals called for her to be fired from CBS for the comments.
“This individual, who was with us for approximately one year, violated the standards of our company and is no longer an employee of CBS. Her views as expressed on social media are deeply unacceptable to all of us at CBS. Our hearts go out to the victims in Las Vegas and their families,” a CBS spokeswoman told Fox News.
3:11 p.m. ET: Police have not publicly identified a motive for Las Vegas gunman Stephen Paddock, but officials said he had a history of gambling and once filed a lawsuit against a Las Vegas casino, which was later dismissed. He rented two rooms at the Mandalay Bay hotel and brought 19 guns and hundreds of rounds of ammunition into the hotel before the attack.
Darrel Stephens, executive director of the Major City Chiefs Association, told Newsweek that Paddock “likely had those [guns] concealed in some way, more than likely in luggage.” Rifles are “easy to disassemble,” he said, and the huge hotel constantly sees people coming and going with luggage.
2:48 p.m. ET: Senate Majority Leader Mitch McConnell called the Las Vegas shooting "shocking" and said, "It's hard to even imagine their pain" as people "begin to wonder how someone could do something this terrible."
McConnell said on the Senate floor that it is a time for "national mourning and for prayer."
2:48 p.m. ET: The GoFundMe page to raise money for the victims of the Las Vegas shooting has raised more than $820,000 in five hours. That amount is a little short of the $1 million goal set for the fund, which will be used to provide relief and financial support to the victims and families of the shooting. Around 6,700 people have donated to the efforts.
2:40 p.m. ET: President Donald Trump led a moment of silence on the White House South Lawn for those killed in the Las Vegas shooting. Trump stood alongside Melania as bells tolled three times, and the two bowed their heads and closed their eyes for a moment before turning and walking back inside. Vice President Mike Pence and his wife, Karen Pence, also joined in the moment of silence.
2:24 p.m. ET: Russian President Vladimir Putin conveyed sympathy and support to Americans in a statement on the Las Vegas shooting. Putin "wished a speedy recovery" to those injured in the attack, which is estimated at 515 people injured and 58 killed. “The crime that took the lives of dozens of civilians is shocking in its cruelty,” Putin said.
The Russian leader also expressed condolences after the Pulse nightclub shooting in Orlando, Florida, when former President Barack Obama was in office.
2:13 p.m. ET: White House spokeswoman Sarah Sanders said it is "premature" to call the Las Vegas shooting that killed 58 "domestic terrorism" and "there is a time and a place for political debate, but now is time to unite as a country."
At a press conference Monday, Sanders said, "Today is a day for consoling survivors." She reaffirmed President Trump's support for the Second Amendment but declined to say if he might support any gun restrictions.
1:45 p.m. ET: One hour and 12 minutes elapsed between the first call to police and breach of Stephen Paddock's hotel room, reported NBC. President Trump has thanked first responders and local police for quickly arriving on the scene.
1:40 p.m. ET: Las Vegas gunman Stephen Paddock, 64, had rented two hotel rooms, one facing north and one facing east, at the Mandalay Bay Hotel before the mass shooting. He checked into the hotel on Thursday, Sept. 28 with at least 19 weapons and hundreds of rounds of ammunition, though it is unclear how they were transported.
Clark County Commission Chair Steve Sisolak confirmed that Stephen Paddock had visited the hotel two other times, and was using his roommate's slot machine card at the hotel and casino. She was in the Philippines at the time of the shooting, reported the Nevada Independent.
After breaking the window of his room on the 32nd floor, likely with a hammer, police said, Paddock fired hundreds of shots, which witnesses said sounded like machine-gun fire. The smoke from his shots set off a smoke alarm and alerted police to his location.
The attack, which injured 515 and killed 58, is the deadliest mass shooting in U.S. history.
1:31 p.m. ET: Former Rep. Gabby Giffords and her husband Mark Kelly, gave a press conference in response to the gun violence in Las Vegas. "This was domestic terrorism. Gabby and I are heartbroken," Kelly said.
Kelly called for a bipartisan federal commission to work toward protecting the second amendment while also keeping guns out of wrong hands. "Your thoughts and prayers aren't going to stop the next shooting," he said.
When asked for a response to people who claim he's politicizing the Las Vegas shooting, he said, "If not now, when?"
1:02 p.m. ET: A Las Vegas trauma center is requesting a waiver from the state to allow out-of-state medical personnel to aid victims of the mass shooting on the Las Vegas Strip Sunday night that left more than 50 dead and more than 500 injured. They are requesting an exemption from the state for the traditional licensing process for visiting healthcare professionals.
“Obviously in this situation where we have this many patients needing care, we need all the medical personnel that are available,” said Amy Shogren, a spokeswoman for the Nevada Hospital Association.
12:33 p.m. ET: Representative Seth Moulton, a Democrat from Massachusetts, said he will not participate in a moment of silence on the floor of the House of Representatives to honor those killed and injured in the Las Vegas shooting.
Moulton said on Twitter that he believes a moment of silence "becomes an excuse for inaction." He followed with a secondary Tweet that said, "Now is not a moment for silence; it's a time for action."
Moulton also reposted a photo of himself serving in Iraq. He posted it after the Orlando shooting at Pulse nightclub with the caption, "I know assault rifles. I carried one in Iraq. They have no place on America's streets." He has criticized lawmakers who promise other mass shootings will be the last time without taking legislative action, saying he is "praying Congress will have the courage to do more than stand in silence to commemorate them."
11:48 a.m. ET: House Majority Whip Steve Scalise, who recently returned to work after being injured in a shooting at a GOP-baseball practice in June, said in a statement, "I agree with the president that this was an act of pure evil. I pay for the victims of this murderous attack, and our whole nation grieves with their loved ones. We also thank the first responders and fellow citizens who did all they could to help those in harm's way. In this tragic moment, I encourage people across America to stand together in solidarity, and to support the Las Vegas community and all of those affected, especially by giving blood and encouraging others to do the same."
11:39 a.m. ET: Sheriff Joe Lombardo said the death toll in the Las Vegas attack has risen to 58 with 515 injured.
A spokesman said there is "no connection" with an international terrorist group, discrediting claims from ISIS that they had converted 64-year-old Stephen Paddock.
The Las Vegas Metropolitan Police Department said residents can donate blood to the hospital if they would like to help the victims of the attack. There is a GoFundMe account through the local level-one trauma center to provide relief and financial support to the victims and families of the shooting.
11:34 a.m. ET: The mayor of France has announced that the Eiffel Tower will go dark this evening in mourning for victims of the Las Vegas attack, and those killed in an incident in Marseille in southern France on Sunday.
Two women were stabbed to death outside the French city's train station Sunday afternoon, and the assailant was shot dead by soldiers stationed nearby. French authorities were investigating the motive as a potential act of terror.
11:29 a.m. ET: Donald Trump has released a presidential proclamation, ordering flags be flown at half-staff at the White House, all public and military buildings, including facilities abroad, until sunset on October 6.
11:23 a.m. ET: Sheriff Lomardo of the Las Vegas police department has tweeted about his phone call with the president, expressing his gratitude.
11:15 a.m. ET: NBC's national correspondent, Peter Alexander reports that Stephen Paddock's brother says their father was also a wanted criminal, on the FBI's Most Wanted list for bank robbery.
The police department in Mesquite have confirmed they searched Paddock's house.
10:58 a.m. ET: A U.S. official told Newsweek that there is no indication that the shooting on the Las Vegas Strip was influenced by Islamic State militant group (ISIS), despite the jihadi group claiming that shooter Stephen Paddock had converted months ago.
A U.S. official, unauthorized to speak publicly and speaking on condition of anonymity, told Newsweek, "There is no indication that there is any link whatsoever. They claim a lot of things."
ISIS regularly claims attacks in the West even if it has not directed them, instead suggesting that it played a role in inspiring them.
10:52 a.m. ET: Attorney General Jeff Sessions said he met with FBI Director Christopher Wray and spoke with Las Vegas Metropolitan Sheriff Joe Lombardo on Monday to investigate the Las Vegas shooting. "To the many families whose lives have been changed forever by this heinous act, we offer you our prayers and our promise that we will do everything in our power to get justice for your loved ones."
10:50 a.m. ET: President Donald Trump called the Las Vegas attack that killed 50 people "an act of pure evil" and pledged his support for the victims and family members. Trump said, "in moments of horror, America comes together as one. It always has."
In the statement, Trump called the attack "senseless" and told Americans that "our unity cannot be shattered by evil. Our bonds cannot be broken by violence."
Trump will visit Las Vegas on Wednesday after traveling to Puerto Rico on Tuesday.
10:43 a.m. ET: House Speaker Paul Ryan has ordered the flags over the U.S. Capitol to be lowered to half-staff. Ryan released a statement saying, "America woke up this morning to heartbreaking news. This evil tragedy horrifies us all. To the people of Las Vegas and to the families of the victims, we are with you during this time. The whole country stands united in our shock, in our condolences, and in our prayers."
10:40 a.m. ET: Pope Francis in a statement said he "sends the assurance of his spiritual closeness to all those affected by this senseless tragedy," from the Vatican. The Pope offered his prayers “for the injured and for all who have died, entrusting them to the merciful love of Almighty God.”
10:33 a.m. ET: The Gun Violence Archive released updated data on gun deaths and injuries in 2017. In this year, there have been 11,652 gun deaths and 23,512 gun injuries with 273 mass shootings.
10:21 a.m. ET: Las Vegas sheriff Joe Lombardo said Las Vegas gunman Stephen Paddock had 10 rifles and hundreds of rounds of ammunition, increasing the count from his earlier estimate of "at least eight" rifles.
Paddock, according to public records, had a hunting license and a pilot's license. It is unclear whether all of the guns were registered in his name. Nevada is an open-carry state, where machine guns and concealed weapons are legal.
The events in Las Vegas on Sunday night marked the 273rd mass shooting in the U.S. in the 275 days that have passed so far in 2017, according to Gun Violence Archive.
10:12 a.m. ET: Nevada Senators Dean Heller (R) and Catherine Cortez Masto (D) have thanked first responders for treating those wounded in the Las Vegas shooting. Over 400 injured have been transported to Las Vegas hospitals.
“My thoughts and prayers are with the families of those killed and wounded in last night’s vicious and senseless attack outside the Mandalay Bay Resort. I thank the first responders for taking down the gunman and working tirelessly to treat the wounded,” Cortez Masto said in a statement.
“Nevada families are waking up to the shocking news of the tragic events that occurred last night in Las Vegas. Our communities are all in mourning as we try to understand this senseless massacre on the strip,” Heller said.
9:57 a.m. ET: Mexican president Enrique Peña Nieto responded to the deadly mass shooting that killed 50 at an outdoor country music festival in Las Vegas, Nevada.
"Mexico condemns and regrets the tragic shooting in Las Vegas," Nieto said. "Our solidarity and thoughts are with the victims and their families."
Nieto expressed his condolences for the "terrible events" and offered support for any Mexicans that may have been affected.
Former President Barack Obama said, "Michelle & I are praying for the victims in Las Vegas. Our thoughts are with their families & everyone enduring another senseless tragedy."
President Donald Trump will address the nation at 10:30 a.m. Monday.
9:38 a.m. ET: Brett Kenyon, a 26-year-old who works at the Cosmopolitan of Las Vegas, a hotel on the Strip, said he was waiting on a table of eight men when he was told about the shooting. The Las Vegas hotel went into lockdown around 10:45 p.m. and no one could enter or leave the building, but they were able to see people from the restaurant windows.
“We could see people on the Strip, just people running and looking scared," Kenyon told Newsweek. "There was lots of confusion as to if there were multiple shooters.”
Kenyon said watched the police and SWAT teams arrive through the restaurant window. After two hours of being under lockdown, and waiting in a "panic" for news about what happened, the hotels were released. Kenyon will return to work Monday night.
“I don’t really have an option," he told Newsweek. "I have to go back. Life goes on.”
9:31 a.m. ET: The first victim of the shooting has been named by his family on Facebook. Quinton Robbins, 20, lived in Henderson, Nevada, worked in its city government and studied at the University of Nevada-Las Vegas.
His aunt, Kilee Wells Sanders, spoke to Newsweek about the family's loss, saying she was "at a loss." A family friend described him as "a pay-it-forward kinda guy," who "always had a smile on his face."
Read more about Robbins here.
9:09 a.m. ET: The suspected shooter killed himself before police gained entry to his room in the Mandalay Bay Hotel, according to Las Vegas Sheriff Joe Lombardo.
In his latest press briefing, Lombardo said that Paddock had been using the ID of Marilou Danley, a woman that police earlier named as a person of interest in the investigation. The sheriff said that police had located Danley outside the United States and that she was not thought to have been involved in the attack.
Lombardo also said that Paddock had checked into the hotel on Thursday and that police had not yet been able to establish a motive for the attack.
Asked why the attack had not been described as domestic terrorism, Lombardo said: “We have to establish what his motivation is first. There are motivating factors associated with terrorism other than a distraught person just intending to cause mass casualty. Before we label with that it will be a matter of process.”
8:43 a.m. ET: Las Vegas police have released a statement on the suspect and the number of injured. The number taken to the hospital now stands at 406, and at least 50 people are dead. There were 22,000 people in attendance at the Route 91 Harvest Festival.
Police also appeared to confirm that Paddock was found dead in the hotel room, stating that when the shooting began, "LVMPD SWAT responded to the call, breached the hotel room and found the suspect dead."
Among the deceased was an off-duty police officer, said the Las Vegas Metro Police Department.
8:33 a.m. ET: The brother of Las Vegas shooter Stephen Paddock said he is "completely dumbfounded" by the shooting. Eric Paddock, who lives in Orlando, told the Orlando Sentinel, “We can’t understand what happened.”
Paddock told The Daily Mail that there was "absolutely no indication he could do something like this" and added that he had no political or religious affiliation. "He was just a guy. Something happened, he snapped or something," Paddock told The Daily Mail.
Paddock has given a statement to police and said he would comment further later.
8:02 a.m. ET: The White House said it is monitoring the Las Vegas shooting closely after a gunman fired hundreds of rounds into a country music festival, killing dozens and forcing thousands to flee the area.
Stephen Paddock, the 64-year-old suspected shooter, died of a gunshot wound at the scene, Las Vegas Metropolitan Police Undersheriff Kevin McMahill told CNN. McMahill would not confirm whether the gunshot was self-inflicted. There were at least eight firearms found in Paddock's hotel room in Mandalay Bay Hotel and Casino.
White House officials and those close to President Trump began responding to the shooting Monday morning. Ivanka Trump said, "America woke up this morning to the horrific news of a devastating mass shooting in Las Vegas. Our collective hearts are breaking for the victims and their families." Donald Trump Jr. tweeted, "Our prayers and deepest condolences are with all those affected by the evil perpetrated in #lasvegas."
The Las Vegas Metropolitan Police Department said "Our condolences go out to the families who lost loved ones tonight. Thoughts and prayers are with all of those affected by this tragedy."
7:50 a.m. ET: A gunman opened fire Sunday night at an outdoor music festival in Las Vegas, Nevada, killing at least 50 people and injuring 200, marking the deadliest shooting in recent U.S. history.
Police named the suspected shooter as 64-year-old Stephen Paddock, who is confirmed dead. The attacker opened fire at the Route 91 Harvest Festival from the 32nd floor of the Mandalay Bay Hotel and Casino at around 10:30 p.m. local time, Las Vegas Sheriff Joe Lombardo said.
Several rifles were found in his hotel room, and Lombardo said the FBI will be involved in the case. The suspect is believed to have checked in as a hotel guest before the attack, the Associated Press reported. Officers are questioning Paddock's roommate, Marilou Danley, and are investigating his house in Mesquite, Nevada, which is about 80 miles from Las Vegas.
Country singer Jason Aldean was performing as the shooting took place. He was not injured and put out a statement saying, "It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night.”
Eyewitness Quinn Mell-Cobb, 24, told Newsweek that the gunshots sounded like they were coming from "everywhere" and initially sounded like "firecrackers." The slow realization that they were gunshots resulted in mass panic and shrieks from the crowd as the gunfire continued. University Medical Center in Las Vegas reported that 104 patients have been admitted with 12 in critical condition.
President Donald Trump was briefed Monday morning on the attack and tweeted, "My warmest condolences and sympathies to the victims and families of the terrible Las Vegas shooting. God bless you!"
This story is no longer being updated.