As Switzerland mourns, authorities are continuing to investigate the cause of the deadly fire and now believe it was triggered by sparklers placed on champagne bottles that came too close to the bar’s ceiling. Investigators are also examining whether the venue’s materials met fire safety regulations. Meanwhile, families anxiously await news of their loved ones, as some victims have been transferred to specialized burn units in hospitals in France and Italy, while six people remain unidentified. Simon Mortiz and Valériane Gauthier have more.