The lawyers of the owners of a Swiss bar where a deadly fire broke out on New Year's Eve killing 40 people and injuring 116 have broken their silence to criticise lies about their clients.

Jessica and Jacques Moretti were devastated, the lawyers told local media, but denied being aware of any dangers at their venue.

There is a sort of public vindictiveness directed against them, one of the three lawyers, Yaël Hayat, said.

Initial findings from the investigation suggest the fire began as sparklers attached to champagne bottles ignited soundproof foaming that lined the ceiling of the basement of Le Constellation bar in the popular ski resort of Crans-Montana.

Authorities have acknowledged that the bar had not undergone safety checks for five years.

Most of the victims were young, with eight under the age of 16, and many are being treated for severe burns.

Numerous stories about the couple have circulated in local media since the fire, increasing pressure on authorities as they investigate and prosecute the owners.

In an interview, the lawyers expressed that the Morettis wish to restore the truth amid growing speculation.

Hayat refuted claims that Jessica left the scene to retrieve cash from the register, emphasizing her commitment to assisting the injured.

Patrick Michod, representing Jacques Moretti, elaborated that the flammable materials were acquired from a major construction retailer without prior notification of their dangers.

Lawyers for the family of Cyane Panine, a staff member who lost her life, claim she received no safety training, highlighting the negligence present in the establishment.

The Moretti couple faces serious charges, including manslaughter by negligence and arson by negligence. Jessica has been placed under a travel ban and must report to police daily, while Jacques remains in custody facing a possible bail requirement.

Amidst the grief of the incident, the couple now confronts the legal ramifications of a tragedy that shocked the community.