India, Jan. 10 -- Switzerland will hold a memorial service Friday, part of a national day of mourning to honour the 40 people who were killed in an Alpine bar fire earlier this month during a New Year's celebration. An additional 116 people were injured, many of them seriously, when the fire broke out less than two hours after midnight at the Le Constellation bar on January 1.

Investigators have said they believe sparkling candles atop Champagne bottles ignited the fire in the resort town of Crans-Montana when they came too close to the ceiling. Authorities are looking into whether soundproofing material on the ceiling conformed with regulations and whether the candles were permitted for use in the bar. Fire safety inspections hadn't bee...