Police in Las Vegas Police are responding to reports of a mass shooting taking place at a country music festival near the Mandalay Bay Casino.
Police are investigating reports about there being one or more active shooters in the area.
There are reports of multiple casualties at the Route 91 Harvest Country Music Festival, The Guardian has reported.
At least 20 victims with gunshot wounds are being treated at One Las Vegas hospital.
Hundreds of people were seen fleeing the area after the shoot-out. Further updates are awaited.