:: US President Donald Trump has called the mass shooting in Las Vegas on Monday “an act of pure evil” after a gunman opened fire, killing at least 50 people.

Trump added during his brief address on the situation that “the nation is joined together today in sadness, shock and grief”.

The American president had earlier tweeted his “warmest condolences and sympathies” earlier Monday morning.

The gunman opened fire from inside the Mandalay Bay Hotel and Casino. Authorities say 64-year-old Stephen Craig Paddock killed himself after the shooting. Police have yet to determine a motive.