France, Jan. 2 -- The fire broke out at around 1:30am local time Thursday at Le Constellation, a bar popular with young tourists.

About 40 people were killed and around 115 others injured, as many as 80 seriously.

Authorities declined to speculate on the cause, saying only that it was not an attack.

Swiss police warned it could take days or even weeks to identify everyone who died.

The bar, on the ground floor of a residential building, has a capacity of 300. Police said the exact number of people inside when the fire broke out remains unclear and did not specify how many people are still missing.

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