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Thousands marched in the Swiss ski resort of Crans-Montana on Sunday to honor the 40 people killed on New Year's Eve.
Authorities say about 40 people were killed and more than 100 injured after a deadly fire at a New Year’s celebration in the Swiss Alps. Swiss officials say the fire caused a sudden explosive ignition. The exact cause of the blaze is under investigation. NBC's Daniele Hamamdjian reports for TODAY.

The New Year's Eve fire at a bar in Crans-Montana killed 40 people and injured 116.