Families of the victims of a fire at a Swiss bar on New Year's Eve have expressed shock after officials admitted the venue had not undergone safety checks for five years.

Romain Jordan, who represents some of the families, said the "staggering number of breaches and shortcomings in the inspections raises the question of whether the municipality should be investigated with even greater urgency".

Other lawyers also urged officials to take responsibility for the disaster at Le Constellation bar in Crans-Montana in which 40 people died and 116 were injured.

Prosecutors believe the fire started when champagne bottles with sparklers attached set light to sound-insulating foam on the ceiling.

The two bar managers have been placed under criminal investigation, but not in custody.