Most of the victims were reportedly young people attending a birthday party. The fire started around midnight at a bar where young people had been gathering to celebrate a private birthday party in the northern city of Rouen, the Paris-Normandie newspaper reports.

Firefighters responded to the emergency, and have declared 13 people dead so far.The fire was allegedly caused by an accidental explosion on site, the publication reports.

Authorities expect the death toll to rise, the newspaper added.

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