Police said the blaze took place in Kerzers, a town in the western canton of Fribourg, at around 6.25pm on Tuesday. The victims have not yet been identified.
Five people have been injured, including an emergency responder, and three of them have been taken to hospital in critical condition, Fribourg police said in a statement.
Man 'set himself alight' in possible 'wilful act'
It is unclear whether any other people have been hurt in the blaze, as officials said it is not known how many people were inside the bus when the fire, which "totally engulfed" the vehicle, started.
A man inside the bus "poured out petrol and set himself alight", a witness claims in a video shared with Swiss newspaper Blick. This account was corroborated by other witnesses, according to the report.
The fire could have been a "wilful act", the spokeswoman of Fribourg's police said at a news conference, adding the force had "information that a person is the cause of the fire".
She said that while police have received information that someone had poured petrol over themselves, she could not confirm this.
Another spokesperson said the fire could have been "deliberately" started, and added police would not reveal whether the alleged perpetrator is among the injured or dead.
Police have not ruled out a terror act and said an investigation is under way.
Officers are set to remain at the scene, where the burnt-out bus is shielded from view by barriers. Residents have been asked to avoid the area.
President 'saddened' by another deadly blaze
Schweizerische Post, the company operating the bus, said in a statement to Swiss paper Der Bund: "Our thoughts are with the injured and the families of the deceased."
Swiss President Guy Parmelin said in a post on X: "It distresses and saddens me that yet more people in Switzerland have lost their lives in a serious fire.
"The background is being clarified. To the relatives of the deceased from Kerzers, I extend my condolences. And I think of the injured & the emergency services."
The bus fire comes just months after a bar blaze in the Swiss mountain resort of Crans-Montana killed 41 people and injured 115 more in the early hours of 1 January.
Most of those who died were teenagers, and many were foreigners, including several from France and Italy.
A new report by the Society of London Theatre (SOLT) & UK Theatre shows record audiences in 2025, with over 37 million people attending theatres across the country,
The West End welcomed a record-breaking 17.64 million - almost three million more than Broadway.
The findings support the theory that as digital content expands, and AI continues to integrate itself into almost every element of our daily life, shared, live experiences have become more relevant than ever.
Data also showed the UK's theatre attendance reflected the full occupational spectrum of the population, largely mirroring the census - busting the myth that theatre is a niche pastime.
But the glowing figures mask a growing financial strain.
Why is British theatre still in the red?
While production budgets have soared, venues have largely held ticket prices steady, with the across the UK resting at £41, and most West End tickets sold for £56 or less.
Many theatres also offer free or subsidised ticket schemes.
The resulting squeeze means 36% of theatres forecast an operating deficit this year, rising to 51% in the subsidised sector.
Many will be forced to cut things like new work, community programmes, or regional tours.
The report flags the importance of theatres within the civic infrastructure, training the writers, directors, designers, and performers who power the wider creative industries, sustaining local high streets and supporting over 100,000 full-time jobs.
Figures showed 95% of theatres deliver programmes that contribute to social good, 86% run workshops with local schools, and 83% provide tickets specifically for local schools.
The report calls for targeted policy changes to stabilise the sector and unlock further growth, including reforming business rates for theatres, strengthening theatre tax relief to support touring productions, introducing stronger incentives for philanthropy, and ensuring public funding settlements keep pace with inflation.
It says such interventions would not be a subsidy, but an investment in a sector that already delivers substantial economic and social returns.
For every £1 spent on a theatre ticket, £1.40 of further spending flows into surrounding restaurants, pubs, and shops, the report says.
'Rising costs on every front'
Claire Walker and Hannah Essex, co-CEOs of the Society of London Theatre and UK Theatre, said: "Theatres across the UK are entertaining millions of people and producing work that inspires audiences around the world. Every day, our members are also running education programmes, supporting young people, and bringing communities together through live performance.
"The public appetite for theatre is clear. But the organisations that make it possible are facing rising costs on almost every front. The challenge now is ensuring this success is sustainable, so theatres across the country can continue creating new work, supporting jobs, and reaching audiences everywhere."
SOLT and UK Theatre represent theatre producers, managers, owners, and operators across London and the UK.
Ivanna Lisette Ortiz, 35, of Orlando, Florida, appeared in court on Tuesday after shots were fired at the star's LA home.
The incident happened on Sunday afternoon, when Rihanna was home with partner A$AP Rocky and their three young children, as well as her mother. Nobody was injured.
In addition to attempted murder, police said Ortiz had been charged with 10 counts of assault with a semiautomatic firearm and three counts of shooting at an inhabited vehicle or dwelling.
The three shooting charges related to Rihanna's house, her trailer - which she was inside at the time - and her neighbour's property.
The assault charges cover Rihanna, her family, two members of staff, and two people in the neighbouring house.
Read more from Sky News:
Mixed review for British theatre
Six dead in 'deliberate' bus fire
No other details of the incident, such as the suspect's possible motivation, were discussed in court.
Ortiz's lawyer Jamarcus Bradford initially entered a not guilty plea on her behalf, but it was withdrawn ahead of an arraingment hearing later this month. She is being held on a $1.8m (£1.4m) bail.
The hearing took place in a courtroom just a few floors from where rapper A$AP Rocky went through a trial last year.
The Courts and Tribunals Bill passed its first vote by 304 votes to 203, a majority of 101.
Ten Labour MPs voted against the plans, while 90 didn't vote at all.
All those who voted against are from the party's left wing and have previously had vocal disagreements with the government on other policies.
It had been thought the government might face a larger rebellion - although Justice Secretary David Lammy was bullish on Monday that the bill would pass.
Not all of those who didn't vote will have actively abstained, as some will have been otherwise busy.
Sky News understands that party managers were not forcing attendance at the vote.
Chief political correspondent Jon Craig said that despite the few actual votes against the bill, this was still a major rebellion and an "ominous warning for the government".
The Conservatives, Liberal Democrats, Reform UK, Greens, and Your Party all voted against.
The bill will now proceed for further scrutiny by MPs.
It would remove the right to a jury trial for cases concerning crimes that carry sentences of up to three years.
Under the proposals, only the most serious cases, such as rape, murder and manslaughter, would be heard by a jury.
The plans have proved controversial, with over 3,200 lawyers writing to the prime minister on Tuesday urging him to "rethink".
Speaking during the debate, Mr Lammy told MPs: "The choice before the House is stark. We cannot continue with this rising backlog.
"Victims are currently worn down, people simply give up, cases collapse and offenders remain free. Free to roam the streets, free to commit more crimes, free to create more victims."
Labour MP Karl Turner, considered the lead rebel against the plans, abstained after he said the government had agreed to put an opponent on the committee of MPs who will scrutinise the bill line by line.
Speaking to Sky News after the vote, Mr Turner said his opposition to the proposals was "stronger than ever".
"I'm now confident that we have the numbers for [an] amendment [to remove] the worst parts of this bill, the jury curtailment stuff, the magistrates extra powers," he said.
But another Labour MP who supports the proposals, Natalie Fleet, told Sky News she was confident the legislation will pass.
"I am standing up for this legislation because it is so important to me and the kind of country I want women to live in... we will see it on the statute books."
Seven Labour MPs voted with the Conservatives on an amendment which would have killed the bill entirely, while 86 abstained.
Former deputy Labour leader Angela Rayner voted with the government on both votes, despite allies claiming she was looking for reassurances from the government on the proposals.
Responding to the bill's second reading vote, Conservative shadow justice secretary Nick Timothy said Sir Keir Starmer and Mr Lammy should "hang their heads in shame". "They have struck the first blow against out ancient legal right to trial by jury," he said.
Liberal Democrat justice spokesperson Jess Brown-Fuller said Labour MPs had "simply sat by" and allowed the government to "push through its disastrous and unpopular plan to slash jury trials".
Camilla warned that a "culture of silence" can "empower violence against women and girls" in a speech to mark International Women's Day, at St James's Palace on Tuesday.
The Royal Family has been faced with numerous allegations about Andrew Mountbatten-Windsor's links with the late paedophile financier Jeffrey Epstein that have continued with the release of the Epstein files. The former prince denies any wrongdoing in relation to Epstein.
The Queen, who is a long-time campaigner against domestic violence and sexual abuse, spoke on Tuesday about the her meetings with French abuse survivor Gisèle Pelicot and the family of Carol Hunt, who was murdered by her ex-boyfriend in Hertfordshire in 2024.
She was wearing a badge, given to her by Ms Pelicot, which read "Shame Must Change Sides".
"To every survivor of every kind of violence, many of whom have not been able to tell their stories or who have not been believed, please know that you are not alone," Camilla said at the event organised by Women of the World, where she is president.
"We stand with you and alongside you, today and every day, in solidarity, sorrow and sympathy.
"Every woman has a story. And these stories must be told. Because when we live in a culture of silence, we empower violence against women and girls," she told guests at the event organised by Women of the World, of which Camilla is president.
Rhiannon Mills, Sky News Royal correspondent said the Queen's comments could be seen as "a very thinly veiled reference to the 'Epstein issue'".
A Buckingham Palace spokesperson said: "I think Her Majesty's speech speaks for itself".
On Tuesday the Queen spoke about the misconception that violence against women is "a woman problem".
"Nor is it helpful to frame it as a 'man problem' in a way that casts all men as potential perpetrators," she said. "It is 'everyone's problem' and only by treating it as such can this scourge be eradicated for good."
Read more from Sky News:
Royals can't control Epstein scandal
Queen pays respects to Jilly Cooper
King concerned over Andrew claims
She said she had met with Gisele Pelicot in February to "hear her story in person, told with grace, strength and, above all, determination that the world's view of violence against women and girls must shift dramatically".
Ms Pelicot was drugged and raped by her ex-husband, who also allowed strangers to rape her while she was unconscious, for almost a decade.
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