The detention was ordered due to concerns over flight risk, as investigators intensify a criminal probe into the tragedy.

The blaze broke out at the Le Constellation bar during a crowded holiday celebration, shocking Switzerland and neighbouring countries.

Authorities are investigating the French owners on suspicion of homicide by negligence and other serious criminal offences.

Local media reported that Jacques Moretti, one of the bar’s co-owners, was remanded in custody following questioning by prosecutors in the canton of Valais.

Under Swiss law, a court must decide within 48 hours whether continued detention is legally justified.

Moretti and his wife Jessica were summoned for a hearing at the public prosecutor’s office in the town of Sion earlier on Friday.

Video footage later showed Jessica Moretti leaving the building alone, while her husband remained in custody.

In a brief statement, Jessica Moretti expressed sorrow for the victims and apologised to those affected by the tragedy.

She said her thoughts remained with the injured and grieving families as investigations continue.

Swiss authorities declared Friday a national day of mourning to honour those who lost their lives in the inferno.

Church bells rang across the country as communities paused to remember the victims.

More than half of the deceased were teenagers, turning the incident into one of Switzerland’s deadliest nightclub disasters.

At least 116 people were injured, many suffering severe burns and smoke inhalation.

The tragedy drew international attention as several French and Italian citizens were among the dead.

Italian Prime Minister Giorgia Meloni called for strict punishment for those responsible for the fire.

French President Emmanuel Macron and Italian President Sergio Mattarella joined Swiss leaders at a memorial in Martigny.

Firefighters, victims’ families and officials observed a minute’s silence and laid white roses in tribute.

Dozens of mourners also gathered near the closed bar in Crans-Montana despite heavy snowfall.

Flowers, letters and teddy bears were placed beneath a protective igloo built to shield the memorial items.

Investigators believe the fire may have been triggered by sparkling candles used inside the venue.

Witnesses said the candles ignited foam soundproofing on the basement ceiling, causing flames to spread rapidly.

Serious questions have been raised about safety oversight at the bar.

The local mayor admitted the establishment had missed several mandatory safety inspections.

Swiss President Guy Parmelin said those responsible must be held accountable without delay or leniency.

Regional leader Mathias Reynard added that political authorities must also answer for any failures.

Prosecutors previously stated that legal grounds for detention had not initially been met.

New findings and concerns over possible evasion appear to have changed that assessment.

Families of the victims have filed legal complaints seeking justice and accountability.

International cooperation is expected as multiple nationalities were affected by the disaster.

Police said victims as young as 14 and 15 lost their lives in the blaze at a popular venue in the alpine resort of Crans-Montana, deepening the national shock.

The tragedy, which claimed 40 lives, has been described as one of the worst disasters in recent Swiss history, sending waves of sorrow across the country.

Investigators confirmed that the number of identified victims has risen steadily as forensic work continues, bringing painful clarity to families awaiting news.

Among those identified are numerous Swiss nationals, along with citizens from Italy, France, Romania, Turkey, and individuals holding dual nationality.

Authorities have chosen not to release names publicly, citing respect for grieving families and ongoing legal procedures.

The youngest confirmed victim is a 14-year-old Swiss girl, while two 15-year-old girls were also among the deceased, officials said.

Ten additional victims were teenagers between the ages of 16 and 18, underscoring the scale of young lives lost during what was meant to be a celebration.

Two Swiss men aged 20 and 31, as well as a 39-year-old French national, were also identified among the dead.

In total, police have formally identified 24 victims so far, with work continuing to confirm the remaining identities.

Across Crans-Montana, residents gathered in silence for church services and vigils, lighting candles and placing messages at makeshift memorials.

Local religious leaders said condolences have poured in from across Switzerland and from around the world, reflecting the global resonance of the tragedy.

A message of sympathy from the Pope was shared during a memorial service, offering comfort to families and communities struggling with loss.

He expressed compassion for the victims’ relatives and solidarity with all those affected by the disaster, church officials said.

Personal stories have begun to emerge, including heartfelt tributes from parents who have confirmed the deaths of their children.

One mother wrote that while her grief was unbearable, confirmation allowed her family to begin mourning and remembering her son in peace.

Swiss President Guy Parmelin announced that a national day of mourning will be held, with church bells ringing across the country.

A minute of silence will also be observed, allowing citizens nationwide to collectively honor the victims.

Authorities said the fire likely began when fountain-style sparklers were used indoors and held too close to the ceiling.

The flames spread rapidly, causing panic and making escape difficult for many inside the crowded venue.

In addition to the fatalities, 119 people were injured, many suffering severe burns that require long-term specialist care.

Due to limited capacity within Switzerland, dozens of patients were transferred to specialized burn clinics in neighboring European countries.

Medical teams from abroad have also been deployed to support Swiss hospitals managing the aftermath of the disaster.

Prosecutors have confirmed that two individuals responsible for operating the bar are under criminal investigation.

They face potential charges including homicide by negligence, as authorities examine safety measures and compliance with regulations.

As investigations continue, Switzerland remains united in mourning, reflecting on the heavy toll of a single night that changed countless lives forever.