Hard Rock Hotel New Orleans: At least one person killed in building collapse with three others unaccounted for

An under construction Hard Rock Hotel has collapsed, killing at least one person, in New Orleans.

News outlets report several construction workers had to run to safety Saturday as the hotel came crashing down.

It was not immediately clear what caused the collapse.

City officials and Governor John Bel Edwards confirmed the fatality Saturday.

Three other people are unaccounted for.

Authorities said 18 people were taken to a hospital for treatment. All were considered stable.

Upper floors began to fall on top of each other before one side of the building fell to the ground below.

WWL-TV aired and tweeted a viewer's dramatic video of the collapse.

"It was a deep rumbling sound," Matt Worges, who saw the collapse from a nearby building, told The Times-Picayune/The New Orleans Advocate.

"Like an airplane maybe. It drew my head immediately."

The hotel was scheduled to open in the spring.