Switzerland: Ski resort tragedy the latest in a line of deadly nightclub fires. Why do they keep happening?

"As Switzerland mourns the loss of 40 people killed in a fire at a ski resort on New Year's, questions about the safety and regulations of large venues have cropped up. Less than a year before Wednesday's fire, a fire at a nightclub in North Macedonia killed more than 60 people."

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"Investigators have not released a definitive cause of the fire but said initial investigations point to sparklers setting it off. Sparklers were also blamed for the North Macedonia fire."

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"Large, deadly venue fires are not everyday occurrences, but they still happen often enough to remain in the back of many people's minds."

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"According to the International Nightlife Association, nightclub fires have killed nearly 4,000 people since 1940. However, it's important to note that this list is incomplete, as it's missing major fires like the one in North Macedonia."