Twitter/AustinOlson
Now playing
01:01
Concertgoer captures chaos among the crowd
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. 
Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
MARK RALSTON/AFP/Getty Images
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Now playing
01:24
MGM Resorts fighting shooting victims' lawsuits (2018)
LVPD
Now playing
01:09
Watch police breach Vegas shooter's room
(CNN) -- In the early days of the investigation into the Las Vegas mass shooting, two people were named as persons of interest in the case, according to newly released police search warrants.        One was deceased shooter Stephen Paddock's girlfriend, Marilou Danley, who has since been publicly cleared in the case. The name of the other was redacted in hundreds of pages of documents released Tuesday to the media.        The Las Vegas Review-Journal has identified that individual as Douglas Haig. Haig did not respond to phone calls Tuesday evening.
KNXV
(CNN) -- In the early days of the investigation into the Las Vegas mass shooting, two people were named as persons of interest in the case, according to newly released police search warrants. One was deceased shooter Stephen Paddock's girlfriend, Marilou Danley, who has since been publicly cleared in the case. The name of the other was redacted in hundreds of pages of documents released Tuesday to the media. The Las Vegas Review-Journal has identified that individual as Douglas Haig. Haig did not respond to phone calls Tuesday evening.
Now playing
01:17
Ammo vendor: No way to see into Paddock's mind
CBS This Morning
Now playing
01:00
Vendor: I didn't conspire with Vegas shooter
NS Slug: VEGAS SHOOTING:SHERIFF-NO RADICAL IDEOLOGY FOUND  Synopsis: Sheriff: Las Vegas shooter didn't leave behind suicide note or manifesto  Keywords: NEVADA LAS VEGAS SHOOTING JUSTICE LEGAL
CNN
NS Slug: VEGAS SHOOTING:SHERIFF-NO RADICAL IDEOLOGY FOUND Synopsis: Sheriff: Las Vegas shooter didn't leave behind suicide note or manifesto Keywords: NEVADA LAS VEGAS SHOOTING JUSTICE LEGAL
Now playing
01:36
Sheriff: New person of interest in Vegas case
las vegas shooters hotel room 2016 orig _00003509.jpg
Courtesy of Jeff Bridges
las vegas shooters hotel room 2016 orig _00003509.jpg
Now playing
00:38
2016 video shows shooter's view
body cam video
Las Vegas Metropolitan Police
body cam video
Now playing
02:43
Las Vegas police release bodycam video
Now playing
02:51
Las Vegas killer's gambling habits revealed
This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)
Las Vegas Metropolitan Police Department via AP
This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley. Danley, 62, returned to the United States from the Philippines on Tuesday night, Oct. 3, 2017, and was met at Los Angeles International Airport by FBI agents, according to a law enforcement official. Authorities are trying to determine why Stephen Paddock, Danley's boyfriend, killed dozens of people in Las Vegas Oct. 1, in the deadliest mass shooting in modern U.S. history. (Las Vegas Metropolitan Police Department via AP, File)
Now playing
02:50
Gunman's girlfriend being questioned by FBI
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. 
Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)
MARK RALSTON/AFP/Getty Images
Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017. Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
Now playing
02:06
Shooter's angle prevented people from escaping
Las Vegas shooter brother background orig mg_00000608.jpg
CNN
Las Vegas shooter brother background orig mg_00000608.jpg
Now playing
01:55
Vegas shooter's brother in disbelief
LAS VEGAS, NV - OCTOBER 02:  A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
David Becker/Getty Images
LAS VEGAS, NV - OCTOBER 02: A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving at least 20 people dead and more than 100 injured. Police have confirmed that one suspect has been shot. The investigation is ongoing. (Photo by David Becker/Getty Images)
Now playing
01:41
Confusion, terror as concertgoers flee
LAS VEGAS, NV - OCTOBER 02:  An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, killing over 20 people. Police have confirmed that one suspect has been shot dead. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
Ethan Miller/Getty Images
LAS VEGAS, NV - OCTOBER 02: An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, killing over 20 people. Police have confirmed that one suspect has been shot dead. The investigation is ongoing. (Photo by Ethan Miller/Getty Images)
Now playing
00:49
Audio: Officers blast through shooter's door
las vegas concert shooter brother sot _00000517.jpg
CNN
las vegas concert shooter brother sot _00000517.jpg
Now playing
02:10
Brother: 'Like an asteroid fell out of the sky'
(CNN) —  

Leaders across the spectrum expressed support for the victims of the Las Vegas tragedy, including President Donald Trump, who delivered a statement Monday in response to the shooting.

“We are joined together today in sadness, shock and grief,” Trump said in remarks at the White House.

Trump said he ordered flags on federal buildings to be flown at half-staff and added that he would visit Las Vegas on Wednesday to meet with first responders and victims.

The President closed his remarks by saying he prayed for “the day when evil is banished and the innocent are safe.”

At least 58 people have been killed and more than 500 injured in the shooting, which began late Sunday night, police said. The suspected gunman was killed following what has now become the deadliest mass shooting in modern US history.

Thoughts and prayers from White House

Earlier Monday, Trump tweeted to offer his sympathies.

“My warmest condolences and sympathies to the victims and families of the terrible Las Vegas shooting. God bless you!” Trump tweeted.

Trump has spoken with Nevada Gov. Brian Sandoval, Las Vegas Mayor Carolyn Goodman and Las Vegas Sheriff Joseph Lombardo by phone, press secretary Sarah Sanders said. Earlier in the morning, the President was briefed on the situation by chief of staff John Kelly, she said.

Sanders called the mass shooting a “horrific tragedy” in her statement.

50+ killed in Las Vegas Strip massacre; suspect had 10 rifles, police say

“We are monitoring the situation closely and offer our full support to state and local officials,” Sanders said. “All of those affected are in our thoughts and prayers.”

An administration official told CNN the President’s trip to Puerto Rico to survey the hurricane response there, which was planned for Tuesday, was under review. Sanders said later in the morning that the visit was still on.

Attorney General Jeff Sessions released a statement saying he met with FBI Director Chris Wray and spoke with the Las Vegas sheriff.

Vice President Mike Pence issued a statement on Twitter, saying he and his wife were praying for the victims.

First lady Melania Trump tweeted her “heart and prayers” to the victims and those affected.

Ivanka Trump, the President’s eldest daughter and a top adviser, tweeted “our collective hearts are breaking for the victims and their families.”

Nevada politicians

Nevada politicians also responded Monday morning to the massacre, decrying the violence and offering thanks to first responders.

“Senseless, horrifying act of violence in Las Vegas tonight,” Republican Sen. Dean Heller, who is from Nevada, tweeted. “Praying for all the victims & those impacted by the tragedy.”

“Thankful for police and first-responders on the scene,” Heller said.

Heller said he had spoken with Sandoval and state Attorney General Adam Laxalt.

Nevada’s Democratic Sen. Catherine Cortez Masto offered prayers to the victims and thanks to the first responders on Twitter.

“Praying for all those affected by this senseless tragedy. Thank you to all the first responders. I will continue to monitor the situation,” Cortez Masto tweeted.

Sandoval, a Republican, called the shooting a “tragic & heinous act of violence” and offered his prayers.

“A tragic & heinous act of violence has shaken the #Nevada family. Our prayers are w/ the victims & all affected by this act of cowardice,” he tweeted.

Sandoval said in a statement that he would be in Las Vegas to meet with law enforcement and first responders and to console victims, their families and friends.

Members of Nevada’s House delegation offered their thoughts as well.

Democratic Rep. Ruben Kihuen thanked the first responders in a tweet, and Rep. Dina Titus, also a Democrat, said in a statement that her “heart aches for the victims, their loved ones and our community.”

Some call for gun control

As the morning wore on, politicians from around the country extended their sympathies to the victims of the shooting and thanks to first responders, while some Democrats issued forceful calls for gun control legislation.

Florida Republican Sen. Marco Rubio, whose state suffered a massive shooting in an Orlando nightclub last year, tweeted his prayers, and Connecticut Democratic Sen. Chris Murphy, who has kept up a drumbeat for gun control in response to the Sandy Hook Elementary School shooting in his state in 2012, tweeted, “Not again.”

Murphy released a full statement later Monday morning calling for swift action on gun control.

“It is positively infuriating that my colleagues in Congress are so afraid of the gun industry that they pretend there aren’t public policy responses to this epidemic,” Murphy said, adding, “It’s time for Congress to get off its ass and do something.”

Murphy’s press secretary, Laura Maloney, told CNN the senator was pushing a variety of measures, including legislation that would close loopholes in the background-check system, crack down on straw purchases and limit access to high-capacity magazines and assault weapons.

He went on to tweet about what he called his colleagues’ “cowardice to act.”

The state’s senior senator, Democrat Richard Blumenthal, said, “The nation’s conscience must be galvanized.”