An explosive fire at a bar in the Swiss Alps killed dozens of people and injured at least 100 others during New Year’s celebrations, police said.

The blaze happened in the Alpine ski resort municipality of Crans-Montana, Switzerland, police said.

"The fire started around 1:30 a.m. this morning in a bar called 'Le Constellation,'" police spokesperson Gaëtan Lathion said. "More than a hundred people were in the building, and we are seeing many injured and many dead."

Swiss police later said "several tens of people" are presumed dead and that around 100 people had been injured – many of them seriously. Authorities could not immediately provide more precise casualty figures. 

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Investigators were working to determine the cause of the fire, police said.

Valais Canton Attorney General said it was too early to determine the cause of the fire but authorities have ruled out terrorism. 

"We're just at the beginning of our investigation, but this is an internationally renowned ski resort with lots of tourists," Lathion said.

The number of injured overwhelmed medical resources, with intensive care unit and operating theater at the regional hospital reaching full capacity. Victims were transferred to other nearby hospitals, officials said. 

A reception center and helpline have been established for impacted families, Lathion said.

Authorities urged local residents and visitors to exercise caution in the coming days to avoid accidents that could further strain emergency medical services during the busy ski season. 

The community is in the heart of the Swiss Alps, about 25 miles north of the Matterhorn.

The Associated Press contributed to this report. 

New York City socialist mayor-elect Zohran Mamdani was officially sworn in as mayor in a midnight ceremony by New York Attorney General Letitia James.

The early Thursday morning event was a private ceremony where Mamdani was accompanied by family members at the Old City Hall Station, a decommissioned subway station with deep historical roots.

In a press release, the Mamdani transition team said the midnight swearing was chosen to be at a location symbolizing how the subway system is the "lifeblood of New York" and a "reminder of the city Mayor-elect Zohran Mamdani is fighting for: a city built by and for New Yorkers."

"When Old City Hall Station first opened in 1904 — one of New York’s 28 original subway stations — it was a physical monument to a city that dared to be both beautiful and build great things that would transform working peoples’ lives. That ambition need not be a memory confined only to our past, nor must it be isolated only to the tunnels beneath City Hall: it will be the purpose of the administration fortunate enough to serve New Yorkers from the building above," Mamdani said in the press release.

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"When I take my oath from the station at the dawn of the New Year, I will do so humbled by the opportunity to lead millions of New Yorkers into a new era of opportunity, and honored to carry forward our city’s legacy of greatness."

Mamdani used a Quran during his swearing-in ceremony, according to his campaign, making him the first Muslim mayor of NYC and the first to be sworn in using a Quran.

On Thursday afternoon, Mamdani will be sworn in publicly by Independent Vermont Sen. Bernie Sanders after opening remarks are delivered at his 1 p.m. inauguration by another progressive ally, Dem. Rep. Alexandria Ocasio-Cortez.

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Typically, inauguration tickets are given out to roughly 4,000 people but the Mamdani transition team says all New Yorkers will be invited to the inauguration and a block party immediately following.

The 1 p.m. inauguration will take place on the steps of City Hall.

Mamdani soundly defeated former New York Gov. Andrew Cuomo and Republican Curtis Sliwa in early November, capping off a rapid political ascent that started with single-digit support when he announced his mayoral campaign in October 2024.