Swiss authorities are investigating a New Year’s Eve blaze that tore through a basement bar in this Alpine resort around 1:30 a.m. Thursday, killing about 40 people and injuring at least 115. Officials said early witness reports suggest a sparkler attached to a champagne bottle ignited the ceiling of Le Constellation during a crowded celebration.
The disaster is among the deadliest nightclub fires in modern Swiss history and turned a night of revelry into a mass-casualty scene within minutes. Valais canton police and emergency crews converged on the center of Crans-Montana as smoke poured from the venue and patrons scrambled up a narrow stairwell to reach the street. Prosecutors cautioned that the cause has not been formally established, even as multiple accounts describe a pyrotechnic candle or “bottle sparkler” lighting overhead materials. Switzerland’s president, Guy Parmelin, called for national mourning and said flags would fly at half-staff as rescue teams work to identify the dead and notify families.
Witnesses described the moment flames raced across the low-slung ceiling after a champagne presentation on the packed dance floor. Several said the room darkened with smoke almost immediately, with heat forcing people toward the stairwell and a crush forming at the door. Others smashed windows to breathe as alarms rang. Firefighters and medics arrived within minutes, according to police, and began triage on the street while crews attacked hotspots below ground. “It happened in seconds,” one survivor said, recalling a rush of heat and confusion as guests tried to pull others to safety. The venue’s capacity was routinely in the hundreds for holiday nights, and patrons included foreign tourists in town for the ski week.
Officials said at least 42 ambulances and more than a dozen helicopters were mobilized, with patients ferried to hospitals in Sion, Lausanne, Geneva and Zurich. Several remained in critical condition by late Thursday. Authorities reported victims from multiple countries; regional leaders in neighboring Italy and France said they were working to account for missing nationals and to support families traveling to Switzerland. Police said there was no indication of a deliberate attack and that explosives were not involved. The attorney general for Valais said forensic teams are examining the scene, reviewing video and interviewing staff and guests to determine how the first flame spread and whether building materials or interior décor accelerated the flashover.
Crans-Montana, a luxury resort known for World Cup ski races and summer golf, was teeming with visitors for the holiday. The bar sits off a commercial street near hotels and rental chalets, part of a dense nightlife strip popular with young travelers. In recent years, Swiss cantons have tightened club safety rules in response to international incidents, emphasizing clear exits, occupancy limits and fire-resistant finishes. Investigators will look at whether the basement layout, the stair configuration and door hardware contributed to the deadly bottleneck, as well as whether any interior panels or acoustic treatments failed fire standards. Authorities have not released the final occupancy count or a verified list of the dead; identification is complicated by severe burns and smoke inhalation.
Legal steps began Thursday with a criminal inquiry into negligent homicide and potential code violations, standard procedure after a mass-casualty fire. Inspectors are tracking the provenance of any pyrotechnic candles used for bottle service and whether they were permitted at the venue. The bar’s operators are expected to face interviews and document requests covering staff training, alarm systems, extinguishers, and evacuation plans. Local officials said the municipality will conduct its own administrative review of licensing and inspections. A timeline for initial findings was not given, but police said scene processing and structural assessments will continue into the weekend, followed by laboratory analyses of debris samples and electrical components.
On the street above the club, the festive lights of the resort’s central avenue gave way to cordons, generators and the thrum of helicopters. Visitors huddled outside hotels, scanning their phones for updates and calling friends who had gone out after midnight. “We heard the sirens and then saw people emerging covered in soot,” said a shopkeeper who opened early to hand out water to first responders. A bar-back from a neighboring venue said staff there quickly checked exits and counted patrons after hearing about the fire. By afternoon, officials had set up a reception center and helpline for families, and neighboring Alpine towns canceled planned fireworks displays in solidarity.
As of Thursday night, the death toll stood at about 40, with at least 115 injured and dozens still hospitalized. Investigators are expected to give a technical briefing once scene work concludes and to release a preliminary report on ignition sources and fire dynamics early next week.
Author note: Last updated January 1, 2026.