Fire crews battled a blaze on the roof of the soon-to-be open Fontainebleau Las Vegas hotel and casino late Saturday afternoon after construction materials caught fire, officials said.

Thick plumes of black smoke could be seen billowing from the roof of the towering 67-story blue glass property, aerial footage from FOX5 helicopters showed.

First responders found the materials on fire after they made their way to the roof, Clark County Fire Chief Billy Samuels said.

It wasn’t immediately clear what sparked the fire or the extent any potential damage at the under-construction property.

It took dozens of firefighters to douse the flames, the chief said, adding the fire was knocked out just before 4.30 p.m.

No injuries were reported, though it wasn’t clear if any workers were onsite when the fire broke out.

In total, 12 engines, four ladder trucks and two air resources responded to the alarms.

The property is scheduled to open its doors in December after sitting dormant at the north end of the Las Vegas strip for close to two decades.

Construction on the Fontainebleau Las Vegas began back in 2007 and had initially been slated to open in late 2009.

Work stopped, however, when they company went bankrupt during the recession — stalling the project for years.