A gunman turned a Las Vegas concert into a killing field Sunday night from his perch on the 32nd floor of the Mandalay Bay Resort and Casino, using at least 10 guns to rain down a steady stream of fire, murdering at least 58 people and injuring more than 500 others in the deadliest mass shooting in modern United States history. The suspect, who died of a self-inflicted gunshot wound, was identified as 64-year-old Stephen Paddock, a resident of Mesquite, Nevada. Police initially sought a woman believed to be Paddock's roommate, Marilou Danley, as a "person of interest." Detectives later made contact with her, and "do not believe she is involved with the shooting on The Strip." Clark County Sheriff Joseph Lombardo said an "excess of 10 rifles" were found in the room, but did not immediately reveal a motive. Paddock had been in the hotel room since September 28, according to Lombardo. Authorities said two on-duty Las Vegas Metropolitan Police Department officers were injured during the shooting. One is in stable condition after surgery, and the other sustained minor injuries. Two off-duty police officers attending the concert were killed. President Trump said the mass shooting "was an act of pure evil," and praised first responders in an address to the nation. "To the families of the victims, we are praying for you and we are here for you," Trump said, adding that he will visit Las Vegas on Wednesday to meet with first responders and families. The gunman, who fired down on the Route 91 Harvest Festival from a room on the 32nd floor of the Mandalay Bay Resort and Casino, died from a self-inflicted gunshot wound just as police made entry to the room, according to LVMPD undersheriff Kevin McMahill. Federal law enforcement sources told Fox News that Paddock "was known to local authorities" in Vegas, and multiple weapons were found in his hotel room in the gold-colored glass skyscraper. At this time, federal officials do not see any connection to international terrorism and little is known about Paddock's motivation, sources said. The Islamic State terror group took credit for the Las Vegas shooting, saying the gunman converted to Islam months ago, but provided no evidence back up the claim. Family member in Florida says Stephen Paddock called his mother, gave no previous indication of violence to come. An FBI official said at a news conference the agency has "determined to this point no connection with an international terrorist group." The gunman's brother, Eric Paddock, told reporters outside his Central Florida home early Monday "an asteroid just fell on us," and said Stephen Paddock has no history of mental illness.
Paddock said his brother is "just a guy" and he "freaked," and had retired to Vegas because he liked gambling. The Department of Homeland Security said Monday morning that the department is "closely monitoring" and helping partners investigate the tragedy, but at this time has "no information to indicate a specific credible threat involving other public venues in the country." Attorney General Jeff Sessions spoke with Sheriff Lombardo offering his full support, Department of Justice officials told Fox News. Sessions said in a statement he met with FBI Director Christopher Wray early Monday morning. "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," Sessions said in a statement. Authorities first received calls about an active shooting at about 10:08 p.m. Country music star Jason Aldean was performing at the Route 91 Harvest Festival when the gunfire erupted. Aldean was performing his last song of the night. Initially, those in attendance said they thought the sound was firecrackers. But as the shots continued, Aldean stopped singing and some concertgoers could be heard yelling to each other to get down. One witness told KSVN that he heard "hundreds of shots." The gunfire was rapid and reportedly confused with firecrackers. "It sounded like a machine gun," one vendor told Fox News. "It sounded like more than one machine gun." Firearms experts hesitated Monday to attribute the shooter's rapid fire from his room on the 32nd floor of the Mandalay Bay Resort and Casino to an automatic weapon's fire. Automatic weapons, sometimes referred to as machine guns, fire a stream of bullets when the trigger is pulled once and held. They differ from semiautomatic weapons, which require one trigger pull for each round fired. Ryan Cleckner, a former U.S. Army Ranger sniper and author of "Long Range Shooting Handbook," said the seemingly inconsistent rate of Paddock's shooting may indicate he was using a device to mimic full-auto fire. These devices, such as a Slide Fire stock, are legal and can be bought for about $300. "These devices take advantage of a firearm's natural recoil to 'bump-fire' the firearm thereby mimicking a machine gun without meeting the legal definition," Cleckner told Fox News. Equipping an AR-15, for example, with a Slide Fire stock would be far cheaper and easier than buying a machine gun. Machine guns in the U.S. can cost upwards of $15,000 and require the buyer to undergo a personally intrusive and months-long application process with the Bureau of Alcohol, Tobacco, Firearms and Explosives. Authorities said law enforcement swarmed the hotel and killed the gunman in a room on the 32nd floor. Responding officers used an explosive device to force the door open into the room, law enforcement officials told Fox News.