Stephen Paddock was found dead in his hotel room with 10-plus rifles after he opened fire on a crowd of more 22,000 concertgoers Sunday night in Las Vegas, police said.
Paddock, 64, was staying at the Mandalay Bay Hotel across the Las Vegas strip from a country music festival. Police said he fired shots beginning about 10:08 p.m. from the window of a 32nd floor hotel room. Bullets rained down on the crowd at the the Route 91 Harvest Festival concert.
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At least 50 people were killed. Overall, 406 people were transported to nearby hospitals, the Las Vegas Metropolitan Police Department reported. Those numbers later increased to 58 people dead and 515 injured.
"Among the dead is an LVMPD officer who was off-duty at the time. His name is being withheld pending notification of next of kin," a statement from Las Vegas police reads. "There were also two on-duty officers injured, one of whom was upgraded recently from critical to stable condition. The other sustained non-life threatening wounds."
Officers found Paddock dead inside the hotel room with more than 10 rifles with him, Sheriff Joseph Lombardo said. Paddock had shot and killed himself.
The sheriff said officers were conducting a search at Paddock's home.
Paddock lived 80 miles outside Vegas
Paddock lived in Mesquite, Nev., which is about 80 miles northeast of Las Vegas. He checked into the hotel room on Thursday, Sept. 28.
Police said they located a woman who may have been Paddock's roommate. The woman has been identified as Marilou Danley, 62. She is in police custody.
The Clark County Sheriff said at the time of the shooting Danley was not in the country and is not suspected of being involved.
Meanwhile, Paddock's motive is unknown. However, the Associated Press reported the Islamic State is claiming responsibility for the attack, saying Paddock converted to Islam months ago.
BREAKING: Without providing evidence, Islamic State claims Las Vegas attack, says shooter converted to Islam months ago.
— The Associated Press (@AP) October 2, 2017
But during a press conference later Monday morning the FBI said this shooting is in no way connected to an international terrorist group. The investigation continues.
Shooter's brother: 'We’re completely dumbfounded'
NBC News reports Paddock's brother, Eric Hudson Paddock of Orlando, Fla., said he does not know why his brother would commit such a crime.
From NBC News:
Paddock said his brother was retired and was "just a guy" who went to the hotels, gambled, and went to shows.
“We are completely at a loss,” Eric Paddock said.
NEW: Shooter's brother says their father was Patrick Benjamin Paddock, a bank robber who he says was on FBI Most Wanted list. @tracyconnor
— Peter Alexander (@PeterAlexander) October 2, 2017
Deadliest mass shooting in US history
This is now the deadliest mass shooting in United States history, surpassing the 2016 Orlando nightclub shooting which killed 49 people and wounded 58 more.
Previously, the deadliest mass shooting had been an attack at an Orlando, Florida, nightclub that killed 49. Before that, the deadliest shooting in the U.S. was the 2007 attack at Virginia Tech, in which a student killed 32 people before killing himself.
Here's a look at some of the nation's deadliest rampages since 2012 (AP):
Oct. 1, 2017: A gunman identified by authorities as Stephen Paddock opened fire on an outdoor music festival on the Las Vegas Strip from the 32nd floor of casino, killing at least 50 people and wounding more than 200. He died at the scene after officers went into the hotel room he was using.
June 12, 2016: Gunman Omar Mateen opened fire at an Orlando, Florida, nightclub, killing 49 people. Mateen was later killed in a shootout with police.
Feb. 25, 2016: Cedric Ford, 38, killed three people and wounded 14 others lawnmower factory where he worked in the central Kansas community of Hesston. The local police chief killed him during a shootout with 200 to 300 workers still in the building, authorities said.
Feb. 20, 2016: Jason Dalton, 45, is accused of randomly shooting and killing six people and severely wounding two others during a series of attacks over several hours in the Kalamazoo, Michigan, area. Authorities say he paused between shootings to make money as an Uber driver. He faces murder and attempted murder charges.
Dec. 2, 2015: Syed Rizwan Farook, 28, and Tashfeen Malik, 27, opened fire at a social services center in San Bernardino, California, killing 14 people and wounding more than 20. They fled the scene but died hours later in a shootout with police.
Oct. 1, 2015: A shooting at Umpqua Community College in Roseburg, Oregon, left 10 people dead and seven wounded. Shooter Christopher Harper-Mercer, 26, exchanged gunfire with police, then killed himself.
June 17, 2015: Dylann Roof, 21, shot and killed nine African-American church members during a Bible study group inside the Emanuel African Methodist Episcopal Church in Charleston, South Carolina. Police contend the attack was racially motivated. Roof has been sentenced to death in the shootings.
May 23, 2014: A community college student, Elliot Rodger, 22, killed six people and wounded 13 in shooting and stabbing attacks in the area near the University of California, Santa Barbara, campus. Authorities said he apparently shot himself to death after a gunbattle with deputies.
Sept. 16, 2013: Aaron Alexis, a mentally disturbed civilian contractor, shot 12 people to death at the Washington Navy Yard before he was killed in a police shootout.
July 26, 2013: Pedro Vargas, 42, went on a shooting rampage at his Hialeah, Florida, apartment building, gunning down six people before officers fatally shot him.
Dec. 14, 2012: In Newtown, Connecticut, an armed 20-year-old man entered Sandy Hook Elementary School and used a semi-automatic rifle to kill 26 people, including 20 first graders and six adult school staff members. He then killed himself.
Sept. 27, 2012: In Minnesota's deadliest workplace rampage, Andrew Engeldinger, who had just been fired, pulled a gun and fatally shot six people, including the company's founder. He also wounded two others at Accent Signage Systems in Minneapolis before taking his own life.
Aug. 5, 2012: In Oak Creek, Wisconsin, 40-year-old gunman Wade Michael Page killed six worshippers at a Sikh Temple before killing himself.
July 20, 2012: James Holmes, 27, fatally shot 12 people and injured 70 in an Aurora, Colorado, movie theater. He was sentenced to life in prison without parole.
April 2, 2012: Seven people were killed and three were wounded when a 43-year-old former student opened fire at Oikos University in Oakland, California. One Goh was charged with seven counts of murder and three counts of attempted murder, but psychiatric evaluations concluded he suffered from long-term paranoid schizophrenia and was unfit to stand trial.