The blast occurred at Le Constellation around 1:30 am local time, when revellers had gathered to welcome the New Year.
Unverified videos circulating on social media showed the bar engulfed in flames amid the celebrations.
#BREAKING: Explosion and fire reported at Le Constellation Bar in Swiss Ski-Resort town of Crans-Montana, Switzerland during New Year's Eve. Several people reportedly killed and critically injured. More details awaited. pic.twitter.com/QDzRrhVUJM
— Aditya Raj Kaul (@AdityaRajKaul) January 1, 2026
When asked about the number of casualties, a Swiss police representative told the BBC, “We can’t say yet. Several.”
Crans-Montana, a town in Switzerland’s Sierre district, has a population of a little over 10,000 people.