CRANS-MONTANA, Switzerland (AP) — A tragic incident at a Swiss ski resort has been traced back to sparkling candles atop Champagne bottles, which investigators believe sparked a deadly fire. The flames erupted after the candles’ sparks reached the ceiling of a bar teeming with New Year’s Eve partygoers.

Authorities are set to examine whether the ceiling’s sound-dampening material met safety standards and if the use of such candles was allowed in the venue. These candles are known for emitting a stream of sparks that shoot upwards.

The devastating fire claimed 40 lives and left 119 people injured early Thursday, tearing through the bustling Le Constellation bar located in the Crans-Montana ski resort. This incident ranks among Switzerland’s most catastrophic events.

Officials will also review other safety protocols within the venue, such as the availability of fire extinguishers and the adequacy of escape routes. The Valais region’s attorney general hinted at potential legal actions if any negligence or wrongdoing is discovered.

Among the missing is 16-year-old Arthur Brodard from Lausanne. His mother, Laetitia, was in Crans-Montana on Friday, desperately seeking her son. She clings to “a glimmer of hope” that Arthur might be one of the six injured individuals who have yet to be identified.

“I’m looking everywhere. The body of my son is somewhere,” she told reporters. “I want to know, where is my child, and be by his side, wherever that may be — be it in the intensive care unit or the morgue.”

The injured included 71 people from Switzerland, 14 from France and 11 from Italy, along with citizens of Serbia, Bosnia-Herzegovina, Luxembourg, Belgium, Portugal and Poland, according to Frédéric Gisler, police commander of the Valais region. The nationalities of 14 people were unclear.

An evening of celebration turns tragic

Among the crowd was Axel Clavier, a 16-year-old from Paris, who said he felt as if he was suffocating inside the Swiss Alpine bar where moments before he had been ringing in the new year.

The teenager escaped the inferno by forcing a window open with a table. The dead included one of Clavier’s friends, and he told The Associated Press that two or three other friends were still missing hours after the disaster.

An impromptu memorial took shape near the bar, where mourners left candles and flowers. Hundreds of others prayed for the victims at the nearby Church of Montana-Station.

A French teenager on Friday brought a bouquet of tulips to the regional hospital in Sion for her best friend, a fellow 17-year-old girl who was badly burned and in intensive care. The two attend school together in Lausanne, said the girl, who was in distress and did not give her full name to the AP.

But when she arrived at the hospital, her friend had been heavily sedated for a dressing change and could not see visitors. It was the latest in hours of heartbreak for the teen, who had intended to join a dozen schoolmates at the bar but ultimately decided against it.

She said she has since learned that two of the 12 are in a Zurich hospital. She did not know if the others survived.

On Instagram, an account filled up with photos of people who were unaccounted for, and friends and relatives begged for tips about their whereabouts.

Valais regional government head Mathias Reynard told RTS radio Friday that officials have “numerous accounts of heroic actions, one could say, of very strong solidarity in the moment.”

He lauded the work of emergency officials on the day after the fire but added “in the first minutes it was citizens — and in large part young people — who saved lives with their courage.”

Servers arrived with burning sparklers

Clavier, the Parisian teenager, said he did not see the fire start, but he saw servers arrive with Champagne bottles topped with the burning sparklers.

Two women told French broadcaster BFMTV they were inside when they saw a male bartender lifting a female bartender on his shoulders as she held a lit candle in a bottle. The flames spread, collapsing the wooden ceiling, they told the broadcaster.

One of the women described a crowd surge as people frantically tried to escape from the basement nightclub up a flight of stairs and through a narrow door.

Another witness speaking to BFMTV described people smashing windows to escape the blaze, some gravely injured, and panicked parents rushing to the scene in cars to see whether their children were trapped inside.

Gianni Campolo, a Swiss 19-year-old who was in Crans-Montana on vacation, raced to the bar to help first responders after receiving a call from a friend who escaped the inferno. He described people on the ground suffering from terrible burns.

“I have seen horror, and I don’t know what else would be worse than this,” Campolo told French television network TF1.

Marc-Antoine Chavanon, 14, joined the effort to get people out of the tavern.

“People were collapsing. We were doing everything we could to save them,” he said. “There was one of our friends: She was struggling to get out. She was all burnt. You can’t imagine the pain I saw.”

The severity of the burns made it difficult to identify bodies, requiring families to supply authorities with DNA samples. In some cases, wallets and any identification documents inside turned to ash in the flames.

Emanuele Galeppini, a promising teenage Italian golfer who competed internationally, was officially listed as missing. His uncle Sebastiano Galeppini told Italian news agency ANSA that their family is awaiting the results of DNA tests, though the Italian Golf Federation on its website announced that he had died.

With high-altitude ski runs rising around 3,000 meters (nearly 9,850 feet) in the heart of the Valais region’s snowy peaks and pine forests, Crans-Montana is a major destination for international alpine skiing competitions. It’s also home to the European Masters each August.

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Leicester reported from Sion, Switzerland. Dazio reported from Berlin. Associated Press journalists Geir Moulson in Berlin, Graham Dunbar in Geneva and Nicole Winfield and Giada Zampano in Rome contributed to this report.