A tragic inferno that claimed the lives of at least 40 individuals and injured nearly 120 others at a luxury nightclub in the Swiss Alps has been linked to a promotional video featuring flaming champagne bottles. These fiery displays, authorities believe, sparked the New Year’s Eve disaster.

The venue in question, Le Constellation, is located in the picturesque resort town of Crans-Montana, Switzerland. The club had previously shared a YouTube video showcasing waitresses navigating the dimly lit, bustling club, carrying champagne bottles adorned with sparkling candles, while wearing helmets for protection.

In the footage, the bottles appear to be held high, at times nearly touching the ceiling.

Following the catastrophe, the area surrounding Le Constellation was cordoned off by authorities. The fire had erupted during New Year’s Eve festivities, sweeping through the basement nightclub of this opulent Alpine destination.

The deadly blaze broke out around 1:30 a.m. on Thursday, as the New Year was being ushered in with celebrations.

The fire’s rapid spread resulted in the tragic loss of at least 40 lives, with 119 others suffering injuries, many of them severe, as flames and smoke engulfed the overcrowded venue.

According to two witnesses, a bartender was carrying a female staff member on his shoulders while she held a champagne bottle fitted with a lit sparkler or flare near the wooden ceiling above the bar area.

Moments later, fire erupted overhead.

Emergency crews and medical aircraft are seen at a regional airport in Switzerland as victims of a deadly New Year’s Eve bar fire in the Alpine resort town of Crans-Montana were transported for treatment. (Reuters/Lisa Leutner)

Valais Attorney General Beatrice Pilloudsaid confirmed on Friday the boozy fireworks were likely the cause, with the flames triggering a violent ignition of combustible gases known as a flashover, causing the flames to spread suddenly.

“The whole ceiling was in flames, and the fire spread really fast. It happened in seconds,” two survivors later told the French broadcaster BFMTV.

Axel Clavier, 16, of Paris, said he felt as though he was suffocating as smoke filled the club.

Clavier told The Associated Press he escaped by using a table to force a plexiglass pane out of its frame amid what he described as “total chaos.” 

He also said he saw waitresses arrive with champagne bottles and sparklers.

Police officers and first responders stand next to a vehicle on the site of a fire that ripped through the bar Le Constellation in Crans-Montana, Switzerland.  (Maxime Schmid/AFP via Getty Images)

As of Friday afternoon, no arrests have been confirmed.

Pilloud said investigators will work to determine if anyone bears criminal liability for fire by negligence, homicide by negligence, or injuries by negligence.

Since the tragedy, hundreds of people have gathered outside the burned-out venue in Crans-Montana, laying flowers and candles as families waited for news of missing loved ones.

Italian authorities said the death toll could be as high as 47, Reuters reported, citing information provided by Swiss officials, who continue working to identify bodies.

Swiss President Guy Parmelin described the disaster as “one of the worst tragedies our country has ever known,” noting that many of the victims were young people celebrating the New Year.

While the majority of those hurt were Swiss, four Serbians were injured, along with others from Bosnia, Belgium and Portugal.

Italy and France confirmed some of their nationals remain missing.

Le Constellation did not immediately respond to Fox News Digital’s request for comment.