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Story summary
- A New Year’s fire at Le Constellation in Switzerland killed at least 40 people.
- Fire experts say hazards such as sparklers igniting flammable foam and a narrow staircase exit contributed.
- Witnesses reported struggling to escape as the fire spread rapidly.
- Investigators have not confirmed the cause, and evidence indicates sparklers started the fire.
- Switzerland's president called it one of the worst disasters in the country and urged safety improvements.
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