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

An official said the sparklers were attached to bottles of champagne held too close to the ceiling. Forty people died and more than 100 were injured. Many of the victims were teenagers.

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.

Swiss investigators say they believe sparklers on Champagne bottles ignited the fatal fire at a Swiss ski resort when they came too close to the ceiling of a bar crowded with New Year’s Eve revelers.

The police said the fire broke out around 1:30 a.m. after an explosion at a bar in Crans-Montana. The number of deaths and injuries was unknown.

Switzerland - Several people have been killed, and others are injured, following a deadly explosion in a bar in the Swiss ski resort of Crans-Montana. A blast at the Crans-Montana ski resort in Switzerland marred New Year's Eve, killing several people and injuring many others, according to the BBC.

Swiss officials say a New Year’s Eve fire that killed about 40 people and injured nearly 120 at a bar in a mountain town was likely sparked by champagne-bottle sparklers that ignited the ceiling, causing a rapid flashover.

Officials confirm likely cause of deadly Switzerland nightclub fire on New Year's Eve that killed at least 40 people.