A fire of "undetermined origin" broke out at the Le Constellation bar in Crans-Montana at about 1:40 a.m. local time, the Cantonal Police of Valais said in a statement.

Following the tragic blast at a New Year’s Eve party at a bar in Switzerland that killed 40, the European nation is holding five days of mourning to honour the victims.

The fire at a bar in a popular ski resort killed around 40 people and injured more than 100, officials said. The cause was still unknown.

Switzerland will hold five days of mourning after an “unprecedented” fire tore through a crowded bar, killing about 40 people and injuring 115 who were celebrating at a New Year’s Eve party in the Alpine ski resort of Crans-Montana.

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Officials: Many more injured, death toll could rise. Investigators say they don’t believe the incident was an attack.

The blaze has broken out at Le Constellation Bar and Lounge in the popular ski resort of Crans-Montana, Switzerland, amid a New Year's Eve celebration with hundreds of people inside