A screengrab from a video of the attack.
Credit: X
Swiss police said on Thursday that several people had died and others were injured due to a fire of unknown causes at a bar called "Le Constellation" in the ski resort of Crans-Montana in southwestern Switzerland.
The area has been completely closed off, and a no-fly zone has been imposed over Crans-Montana, the police said in a statement.
"Several people lost their lives and others were injured," the statement said, describing the incident as "serious" and said "a major emergency response is underway".
"A large contingent of police, firefighters, and rescue workers immediately went to the scene to assist the numerous victims," it said.
"The operation is still ongoing."
Swiss daily Blick cited a doctor at the scene suggesting that the death toll could be in the "dozens".
Regional daily Le Nouvelliste also said its sources were describing "a heavy toll", with "around 40 dead and 100 injured".