At least 40 were killed and a further 119 were injured in the blaze that swept through the Constellation bar in Crans-Montana in the early hours of New Year's Day.
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A former Hertfordshire schoolgirl is among the teenagers still missing.
The severity of burns is making it harder to identify the dead and injured. Experts are relying on DNA samples for some cases, in a process that could take weeks.
Scrutiny turns to safety set-up and fire's cause
On Friday officials tentatively confirmed a theory circulating online about the cause of the fire.
"It would appear that the fire started from sparkler candles, otherwise known as flares, which were placed on top of champagne bottles," Valais attorney general Beatrice Pilloud told a news conference.
Images shared on social media showed a group of people with sparklers affixed to bottles that appear to be setting fire to the ceiling, and a woman on a man's shoulders holding up champagne bottles with sparklers in them.
But Ms Pilloud said it was too soon to say whether a foam-like material on the ceiling, possibly sound-proofing, had contributed to the spread of the fire.
A retired fire firefighter told Sky News the same type of material used to clad Grenfell Tower was likely coating the ceiling of the basement bar.
Having reviewed images and videos circulating online, Steve Dudney said he believed the foam that ignited was highly flammable polyurethane, which should be "nowhere where there are uncontrolled naked flames".
Ms Pilloud said the bar's owners, Jacques and Jessica Moretti, a French couple, were interviewed as "people called to give information", not under caution.
There are many outstanding questions about the nature of exits and about safety protocols in the bar. It had more than one emergency exit, but it wasn't found by victims.
Agonising wait for families
The severity of the damage means details about the victims have emerged in instalments, leaving relatives in a painstaking limbo.
Some 22 young patients are in critical condition at Lausanne University Hospital.
The injured included 71 from Switzerland, 14 French nationals and 11 Italians, along with citizens of Serbia, Bosnia-Herzegovina, Luxembourg, Belgium, Portugal and Poland, according to Frederic Gisler, police commander of the Valais region.
The nationalities of 14 people were unclear.
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Who has been named so far?
Those still unaccounted for include Charlotte Niddam, who previously attended Immanuel College, a private school in Hertfordshire. Her nationality has not been confirmed.
According to the Crans-Montana resort website, she had been working as a babysitter in the area.
Italian national Emanuele Galeppini, 17 and a golf prodigy, was the first victim to be reported dead, with news confirmed by the Italian Golf Federation earlier on Friday.
Another teenager who is still missing is Arthur Brodard. CNN reported that the Swiss 16-year-old joined around 10 of his friends on New Year's Eve at Le Constellation.
His parents Laetitia Brodard and her husband Christophe, who are from the Swiss city of Lausanne, said the group often met in the resort town.
"We are so empty," Mr Brodard said. "We think he could still be alive, so we still have hope of finding him."
He added: "They ordered a bottle of champagne with a sparkler. One or two minutes later, it was the apocalypse."
Alice Kallergis, a 15-year-old girl from Greece, is also reportedly missing. Her brother, Romain, told protothema.gr: "We still know nothing about my sister."
The family of another young person has appealed for information.
Emilie Pralong has been missing since the fire, according to posts on Facebook.
A number of weather warnings for snow and ice have been issued by the Met Office, with multiple yellow alerts extended into Monday.
In north Scotland, amber snow warnings are in place until midday on Saturday.
On Saturday and Monday, the east coast of England is expected to be hit by blizzardy conditions.
At Loch Glascarnoch in the Scottish Highlands there was in excess of 8cm of lying snow on Friday morning, while Aboyne in Aberdeenshire had around 9cm of lying snow.
The chilly conditions have already led to the closure of several snow gates, stopping travel on some roads.
Traffic Scotland said the snow gates on the A93 Braemar-Glenshee, A939 Tomintoul-Cockbridge, B974 Cairn O'Mount-Fettercairn and at Bealach na Ba were shut on Friday morning.
Highland Council said it had received reports of campervans and cars stuck on ice in tourist hotspots. It has advised motorists to drive with caution.
The areas covered in the amber warnings include Angus, Perth and Kinross, Aberdeen, Aberdeenshire, Moray, and the Highlands.
Around 10-20cm of snow is likely at low levels, with 30-40cm possible on higher ground, while winds could lead to temporary blizzard conditions, according to the Met Office.
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The weather is expected to have an impact on transport, with those heading out urged to prepare for longer journey times by road.
Some delays and cancellations to rail and air travel are likely, as are power cuts, according to the Met Office.
Chief Superintendent Scott McCarren, Police Scotland's head of road policing, said: "Please don't drive through road closures, the decision to close roads is not taken lightly and is done for public safety."
Parts of England also saw a blanket of snow as 2026 got off to a wintry start.
A yellow weather alert for snow and ice is in place across most of Wales, while a yellow warning for ice in the southwest of England was issued by the Met Office on Friday morning.
A yellow weather alert for much of Northern Ireland is in place, with the country warned to expect snow and ice until midday on Monday.
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Met Office chief meteorologist Rebekah Hicks said: "Arctic air and brisk northerly winds are gripping the UK as we start the new year.
"Snow and ice warnings remain in force for many areas, with the risk of heavy snow showers, especially across northern Scotland and over higher ground elsewhere, though many inland areas will stay largely sunny and clear.
"Bitterly cold conditions will persist through the weekend and into next week, with daytime temperatures struggling to rise above freezing for some, and overnight lows dipping to minus double figures in places."
Meanwhile, the UK Health Security Agency (UKHSA) has issued amber warnings which will remain in place until 10am on 9 January.
The alert has been issued for the East Midlands, West Midlands, North East, North West, South East, South West, East of England, Yorkshire and the Humber, and London.
The UKHSA said it means the weather is "likely" to cause significant impacts across health and social care services, including a "rise in deaths" among those with health conditions or aged 65 or over.
More than 2,000 magistrates have been trained since 2022, and ministers want to recruit the same number again over the next financial year, the Ministry of Justice (MoJ) says.
The recruitment effort is part of the government's bid to reduce the backlog and speed up justice for victims, and comes on the heels of the announcement of a series of reforms - including controversial plans to limit jury trials.
Deputy Prime Minister and Justice Secretary David Lammy said: "Magistrates play a vital role in our court system - hearing thousands of cases across every jurisdiction and delivering justice.
"They are everyday heroes - and we need more people of every age and background to volunteer not just to deliver justice but to serve and represent their local communities.
"Volunteering to become a magistrate can make a real difference to your life and the lives of others - that's why I'm calling on the public to apply and play your part."
The Magistrates' Association said the move was a "big vote of confidence" in magistrates, but more resources are needed for the courts, including enough trained, well-paid legal advisers, and repairing crumbling court buildings.
What's expected of new recruits?
Magistrates are expected to volunteer at least 13 days a year to hear cases, and judiciary bosses are seeking candidates with good communication skills, a sense of fairness and the ability to see an argument from different sides.
New recruits are wanted across criminal, youth, and civil and family proceedings, and have specialist legal advisers to support them to deal with a range of cases.
According to the latest figures from the MoJ, 57% of magistrates are female and 14% come from an ethnic minority background, aside from London where it is the highest proportion of 31%.
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Shadow justice minister Kieran Mullan welcomed efforts to recruit more magistrates, but said it "cannot paper over the failings of a justice secretary and Labour government that has consistently failed to deliver meaningful reform."
The senior Tory described the previously announced plans to scrap jury trials as "reckless", and warned it "risks undermining public confidence".
The drive to recruit new magistrates comes after Mr Lammy announced a series of proposals last month to overhaul the courts, including increasing magistrates' sentencing powers up to 18 months' imprisonment, up from 12 months currently, so they will be able to deal with more serious cases.
But the most controversial of the planned reforms is to remove the right to a jury trial for defendants who are likely to get a sentence of three years or less.
It has sparked concerns across the political spectrum, and 38 Labour MPs have come out publicly against the move, describing it in a letter to the prime minister as an "ineffective way" of dealing with the backlog, although it is understood that more are privately opposed as well.
Officials were first alerted to reports of people in trouble near Withernsea at 3.10pm on Friday. A 67-year-old man was found unconscious in the water and later confirmed to have died.
Late on Friday evening, Humberside Police said a second body was recovered from the sea and added that "circumstances are not believed to be suspicious."
Searches are ongoing, and one person is still thought to be missing.
The force asked people to avoid the area to allow the emergency services to carry out their work.
HM Coastguard said it had deployed a search and rescue helicopter and a fixed-wing aircraft to the scene on England's east coast.
The rescue operation also called in local coastguard and RNLI (Royal National Lifeboat Institution) rescue teams, Yorkshire Ambulance Service, an air ambulance, Humberside Police and Humberside Fire and Rescue.
Temperatures in the seaside town are forecast to drop to freezing overnight.
Earlier, East Riding of Yorkshire council confirmed a severe weather protocol was in place due to the cold.
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Hornsea Inshore Rescue, a local independent group of volunteers, earlier said the treacherous conditions had stopped it from launching.
"Called out, unable to launch the lifeboat due to horrendous conditions and 3 metre waves breaking on our slipway which would knock the tractor and trailer sideways off the ramp," it said in a statement on social media this afternoon.
In a post yesterday, the group said it had called off a New Year's Day public swim because "the sea conditions were just not suitable today for us to condone anyone entering the water".
Yesterday in Brighton a 51-year-old man died after getting into difficulty in the water.
In a post on his social media platform, Truth Social, on Friday, Mr Trump wrote: "If Iran shoots [sic] and violently kills peaceful protesters, which is their custom, the United States of America will come to their rescue."
"We are locked and loaded and ready to go."
At least seven people have been reported to have been killed in violence during protests sweeping parts of Iran, including capital Tehran. They have been sparked in part by the collapse of country's rial currency.
In response to Mr Trump's post, the secretary of Iran's Supreme National Security Council, Ali Larijani, wrote on X: "Trump should know that U.S. interference in this internal matter would mean destabilising the entire region and destroying America's interests.
"The American people should know - Trump started this adventurism. They should be mindful of their soldiers' safety."
America has a large wide military footprint in the region and tensions had already been rising with Iran. In June the Islamic republic attacked the US Al Udeid Air Base in Qatar.
The missile launches were a retaliation for US strikes on three nuclear sites during Israel's 12-day war on the Islamic Republic, also in June.
Protests in the Iran have now reached their sixth day, making them the biggest since 2022, when the death of 22-year-old Mahsa Amini in police custody triggered nationwide demonstrations.
But the protests have yet to go countrywide and have not been as intense as those surrounding the death of Ms Amini, who was detained for not wearing her headscarf to the liking of authorities.
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The latest demonstrations were initially triggered by economic concerns, but have included chants against Iran's theocracy.
Iran's civilian government led by reformist President Masoud Pezeshkian has been trying to signal it wants to negotiate with protesters.
But Mr Pezeshkian has acknowledged there is little he can do as the currency rapidly depreciates, with one dollar now costing some 1.4 million rials, pushing up domestic prices.