'Active shooting' reported at Bellagio hotel in Las Vegas, security beefed up

Las Vegas: An active shooter opened fire at the Bellagio hotel in Las Vegas according to reports.

Guests at the hotel tweeted photographs of the chaotic scenes observed outside the hotel.

"Mass panic at Bellagio.Everyone running. I'm currently ducked on the floor under a table," a guest at the hotel wrote on Twitter.

A video uploaded on social media showed dozens of police cars surrounding the hotel.

More details awaited.