ZURICH — Several people were killed and others injured after a fire broke out at a bar in the ski resort of ‍Crans-Montana in southwestern Switzerland, Swiss police said Thursday. The fire broke out at 1.30 a.m. (9:30 a.m. Korea time) in ‍a bar called Le Constellation, police said ‍in a statement. Swiss ‌media said the blaze was ‍sparked by an explosion. The area has been completely ‌closed off, and a no-fly zone has been imposed over Crans-Montana, police ‍said, adding that the cause of the ‍fire remained unclear. More than 100 people were in the bar at the time ‍of the explosion, Swiss media outlet Blick reported, citing police.