The distraught owners of the Swiss nightclub where at least 40 revelers were killed in a raging New Year’s Eve fire insisted their venue followed every safety regulation before the unthinkable tragedy.

Jacques and Jessica Moretti spoke out for the first time since the deadly blaze tore through Le Constellation nightclub after sparklers attached to champagne bottles ignited the ceiling during the boozy bash.

“Everything was done according to the regulations,” Jacques, 49, told Swiss outlet La Tribune de Genève.

Jessica Moretti, a woman with long dark hair, wearing a black blazer.
Jacques and Jessica Moretti have owned Le Constellation nightclub in Switzerland since 2015.Jessica Moretti LinkedIn

“We can neither sleep nor eat. We are not well.”

The owners said their bar, located at the Crans-Montant ski resort in the heart of the Swiss Alps, had been inspected three times over the past 10 years.

The couple, who were interviewed by police Friday, vowed to work and cooperate with authorities amid the investigation into the fiery nightmare.

Flashover in an enclosed space with a bright orange light emanating from the ceiling.
they insisted to Swiss media that their venue followed every safety regulation.

“We will do everything in our power to help clarify the causes,” the shaken husband told the outlet.

“We are doing everything in our power. Our lawyers are involved.”

The French couple bought the club in 2015, transforming a once-rundown cafe into a nightlife hotspot in the popular ski destination, according to Swiss media.

While Jacques was at a nearby property when the blaze erupted after midnight, his 40-year-old wife was reportedly inside the jam-packed club and suffered burns to her arm in the horror.

Collage of a fire starting on a ceiling from sparks from a bottle in a club, and a person wearing a Guy Fawkes mask and holding a woman on their shoulders who is holding champagne bottles with sparklers.
The flames spread quickly through the bar making it difficult to breathe around 1:30 a.m. Thursday morning.

The flames spread quickly through the bar, which could hold up to 300 people, making it difficult to breathe around 1:30 a.m. Thursday morning.

The initial fire then triggered what firefighters refer to as a “flashover,” in which all the combustible material in a room ignites at once, causing multiple explosions, Swiss authorities said.

A haunting new photo captured the moment the fire erupted, showing flames spreading over the low ceiling as unsuspecting partygoers waved their sparklers and bottles high in the air.

Rescuers at the site of an explosion in Crans-Montana, Switzerland.
The initial fire then triggered what firefighters refer to as a “flashover.”AFP via Getty Images

“It was firework candles inside a champagne bottle that caused the explosion. The entire ceiling of the bar caught fire,” one witness, who gave her name as Victoria, told French broadcaster BFMTV.

Another image captured a woman in a crash helmet holding up lit bottles while being carried back on the shoulders of a masked man.

The sparkers appeared to be a popular party gimmick of Le Constellation.

Police officers and rescuers stand near a red firefighter's vehicle at the site of an explosion in Crans-Montana.
Sparklers attached to champagne bottles ignited the ceiling during the boozy blowout. AFP via Getty Images

Promotional videos from last year showed waitresses weaving through the crowd with flaming champagne bottles held aloft and nearly brushing against the ceiling.

“Several people have been interviewed and observations have been made on the premises,” Swiss prosecutor Beatrice Pilloud told reporters Friday, noting the investigation will determine if the owners bear any “criminal liability,” according to the US Sun. 

“We will also focus on the number of people who were present at the party, the number of people that the bar is authorized to host, the exit routes and the access routes into the premises.”

Candles at a memorial outside the "Le Constellation" bar after a fire and explosion.
Candles at a memorial outside the Le Constellation following the deadly blaze.REUTERS

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Authorities are working to identify the victims, many of whom are believed to be foreign tourists visiting the popular resort. The mostly young crowd suffered fatal burns so severe that Swiss officials said it could take days before the bodies are all identified.

Government officials noted experts are combing through dental records and DNA to ID the victims.