The US Department of Homeland Security is investigating a mass shooting by a lone gunman on a music festival in Las Vegas, Nevada, killing at least 59 people and injuring more than 525.

Sixty-four-year-old retiree Stephen Paddock was identified as the lone gunman, according to media sources.

Paddock is said to have conducted the mass firing on a large crowd from the 32nd floor of the Mandalay Bay hotel, Reuters reported.

More than 16 rifles were found in Paddock’s hotel room with hundreds of rounds of ammunition, the New York Times reported.

“The FBI and the Department of Homeland Security are working closely with local authorities to assist with the investigation.”

Commenting on the attack, US President Donald J Trump said: “The FBI and the Department of Homeland Security are working closely with local authorities to assist with the investigation, and they will provide updates as to the investigation and how it develops.”

Authorities have also discovered 18 weapons and explosives at Paddock’s home in Mesquite, Nevada, according to The Sydney Morning Herald.

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The gunman killed himself before the police could reach the hotel room.

Although ISIS has claimed responsibility, the US officials have denied the militant group’s link to Las Vegas shooting.