COP TELLS HOW THE NIGHTMARE UNFOLDED

WITH dozens killed and more than 100 people injured, the nightclub blaze has been branded one of Switzerland's worst tragedies.

- BY SIMON MURPHY

The emergency response swung into action after smoke was spotted coming from the bar.

Valais Canton police commander Frederic Gisler gave a detailed account of the efforts to tackle the blaze, which some believe was started by sparklers.