Their injuries are not life-threatening, police have said.
Dyfed-Powys Police say the incident happened at about 11.20am on Wednesday morning.
The force confirmed the school was put into lockdown “for the safety of all on the premises”.
Pupils were released from the school at around 3.20pm, with hundreds of parents gathered outside to collect them.
The teenage girl is currently in police custody and a knife has been recovered in evidence, police said in an update at the scene.
The comprehensive school in the town of Ammanford in Carmarthenshire has over 2,000 pupils between the ages of 11 and 18.
The school had been in lockdown since about 11am, with pupils told to stay in their classrooms.
Hundreds of parents were assembled outside the school by 3pm, waiting to collect their children from the school.
Rachel Young, a parent at the school, told Sky News her daughter and other pupils had been “locked” in the classroom.
“She’s scared obviously. She says she’s fine, but they all say ‘I’m fine’ but they’re obviously not going to be and what’s going to happen from now on, I don’t know. We don’t even know if the school’s going to be open,” she said.
“I wanted to get here. I rang the school and they said they’re not allowing anyone in or anyone out, but they couldn’t really comment any further than that.”
A spokesperson for Ysgol Dyffryn Aman said the family members of the injured have been informed.
“We would like to reassure parents and the public that the incident has been contained,” they added.
Dyfed-Powys Police said it was aware that footage of the incident was “circulating on social media”.
“We would ask that this is removed to avoid contempt of court and distress to those affected,” a spokesperson said.
Police have also asked people not to speculate as the investigation is ongoing.
Prime Minister Rishi Sunak expressed his “shock” at the news.
‘Close and welcoming community’
In the Senedd, Lee Waters, a former pupil of the school who represents Llanelli, asked an emergency question on the incident.
“Ammanford is a close and welcoming community,” he said.
“I think the fact now that this is happening in the social media age adds further distress to it.”
Lynne Neagle, Wales’s education secretary told Senedd members it was “very important” to let the police undertake their investigation.
“They were very clear with myself and the First Minister earlier that lots of speculation is not helpful,” she said.
“We need to let them do their job at the same time as making sure that we support the school and the community through this very difficult period.”
Superintendent Ross Evans, Carmarthenshire Commander, said police were working with the school and other agencies to ensure “appropriate support is available to all involved”.
“This was a very distressing incident and our thoughts are with the victims, their families and everyone impacted by what has happened,” he added.
“Local people will see more police in the area over the coming days as the investigation continues.”
‘Shocking incident’
Leader of Carmarthenshire County Council, Darren Price, praised the teachers, staff and pupils of Ysgol Dyffryn Aman “for the way they’ve responded to this shocking incident”.
“As a council, our priority now is to do all that we can over the coming days and weeks to support the pupils and staff in the aftermath,” he said.
“Today’s events have come as a grave shock to the school community, to Ammanford, Carmarthenshire, and further afield.
“To support Dyfed-Powys Police, Ysgol Dyffryn Amann will be closed tomorrow (Thursday) to all pupils and staff in order for officers to further carry out their investigations.
“Although the school will be closed, I want to reassure pupils, parents and staff that well-being support is available to anyone who has been affected. The school will continue its lessons online.”
Anyone with information that could help officers with their investigation is asked to contact Dyfed-Powys Police.
Scotland’s former first minister Nicola Sturgeon has announced she has split from her husband, Peter Murrell.
Ms Sturgeon and Ms Murrell met via the SNP and first became a couple in 2003. They later married in July 2010 at Oran Mor in Glasgow.
In a statement posted to Instagram stories, she wrote: “With a heavy heart I am confirming that Peter and I have decided to end our marriage.
“To all intents and purposes we have been separated for some time now and feel it is time to bring others up to speed with where we are.
“It goes without saying that we still care deeply for each other, and always will.
“We will be making no further comment.”
Ms Sturgeon unexpectedly announced she was stepping down as Scotland’s first minister and SNP leader in February 2023 after succeeding Alex Salmond following the independence referendum in 2014.
Mr Murrell, who had been SNP chief executive since 2001, resigned from his post the following month after taking responsibility for misleading the media over party membership numbers amid the leadership race, which Humza Yousaf went on to win.
At the time, he said: “While there was no intent to mislead, I accept that this has been the outcome.”
In April 2023, Mr Murrell was arrested as part of a probe into the SNP’s funding and finances. He was later charged with embezzling SNP funds in April last year.
Ms Sturgeon and ex-party treasurer MSP Colin Beattie have also been arrested and released without charge as part of Police Scotland’s long-running Operation Branchform.
The probe, which has been ongoing since July 2021, is linked to the spending of around £600,000 raised by SNP supporters to be earmarked for Scottish independence campaigning.
Meantime, Ms Sturgeon continues to deny any wrongdoing.
In an interview last month, the Glasgow Southside MSP said she knew “nothing more” about the inquiry and was getting on with life “as best I can at the moment”.
MPs will today debate a change in the law proposed by a bereaved mother who believes social media may hold crucial clues to her son’s death.
Jools Sweeney was 14 when he was found unconscious at home in April 2022.
His parents and friends who saw him earlier that day say there were no signs he was depressed.
A coroner found he took his own life, but that he probably did not intend to, as he was unable to confirm he was in a suicidal mood.
His mother Ellen Roome suspects he may have taken part in an online challenge.
She has spent two years trying to get access to his social media accounts but says the tech companies have made it “very difficult”.
Her petition to allow bereaved parents or guardians to access a child’s full social media history attracted 126,000 signatures, known as Jools Law, and will be debated in parliament later.
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“Earlier in the day he was playing football with a group of friends,” she said.
“You can see on our security camera he said goodbye to his friend, all chirpy, an hour and a half before I got home.
“We can’t have all, his parents, friends, teachers, grandparents, missed depression. And so we’re left with these huge question marks,” she said.
“The pain in my heart of not knowing what happened that night or why is incredibly hard. I don’t want another family to go through it.”
‘It’s my gut feeling and I just want to know’
Ms Roome, 48 from Cheltenham, Gloucestershire, fears her son may have taken part in an online challenge which led to his death.
The police and coroner did not gather forensic data from his phone.
With help from her son’s friends, Ellen has been able to unlock his phone and access some of his accounts, but some material has been deleted.
She says the tech companies have not given her full access to what Jools was looking at before his death.
“I have always said I don’t know it’s social media but that’s always been my gut feeling and I just want to know – it’s the missing piece of the jigsaw,” she said.
“He did an awful lot of challenges, like standing on his hands putting a t-shirt on upside down. I thought they were fun, viral challenges. I never knew about some of the more dangerous ones.
“The police didn’t ask for the data from social media companies. The detective didn’t even find out he had more than one TikTok and Instagram account.”
She says the social media companies have not given her all his messages and browsing history.
“They could say ‘here it is, I hope you get some answers’. They could redact the details of other children.”
Jools died a week after 12-year-old Archie Battersbee from Southend-on-Sea, Essex, was left brain-damaged by what a coroner concluded was an online prank and later died.
Sky News has contacted Meta, which owns Instagram, as well as TikTok and Snapchat. None provided an on-the-record statement, but they are understood to have been in contact with Ms Roome.
Police ‘supporting’ family
A spokesperson for Gloucestershire Constabulary said they were limited in what they could request because it was not a criminal case.
“We cannot fathom how upsetting it must be for the family to not have answers after Jools took his own life.
“We supported the Sweeney family and coroner’s office throughout an investigation into the cause of his death.
“As part of this Jools’s phone was given to police and a review of the contents took place, as well as the manual review of a TikTok account. Nothing was found as part of these searches to provide any answers.
“Police are limited in what lines of enquiry can be taken to access private social media accounts hosted by private companies due to legislation, which states that you have to be proving or disproving an indictable offence, which is not applicable in this case and therefore there was no legal basis to apply for a production order.
“We know this sadly doesn’t help Jools’ family get the answers they are searching for, and we continue to support them with their own application for access to his social media accounts.”
A TikTok representative held a meeting with Ms Roome last year and explained that the law requires companies to delete people’s personal data – unless there is a police request for it.
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In April 2024, new powers allowing coroners to require the production of social media evidence were introduced. Jools’s inquest was by then closed.
Ms Roome is preparing a case to go to the High Court to get a fresh inquest and is crowdfunding the £86,000 cost to find answers.
The government issued a response to Ms Roome’s petition, saying that tech companies should respond to requests from bereaved parents in a “humane and transparent way”.
A new Digital Information and Data Bill, to be passed this year, would compel social media companies to retain data in cases where a child has died, so a coroner can request it.
But Ms Roome is worried it would not compel coroners and police to request the data.
“I don’t want any other family to be in the position I am two-and-a-half years after my son’s death. It should be automatic,” she said.
Her lawyer Merry Varney, partner at Leigh Day, also represented the family of Molly Russell who fought for months to access what she saw online.
‘It’s left to parents to fill the gaps’
Ms Varney told Sky News: “Getting that information is incredibly difficult, it’s a moving target. You’ve got the posters of the content, they control whether it’s deleted or made private.
“The social media companies take this line ‘it’s not for us, it’s not our responsibility’, which makes for a very challenging set of circumstances – and it’s not right.
“There’s a lot the social media and tech platforms say about wanting to help, to be seen to be doing the right thing. But are they transparent about the gaps? No.
“It’s left to the parents to fill the gaps themselves and it can be costly and difficult.”
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Technology Secretary Peter Kyle spoke to Sky News in November. He said: “Coroners have the power now to compel the release of that data so it can be looked at.
“I’m going to be looking very, very closely at how those powers are used, that all coroners know that they have those powers and then if there’s any additional powers that are needed going forward, then, of course, you know, I’m all ears to see how that could work.”
Anyone feeling emotionally distressed or suicidal can call Samaritans for help on 116 123 or email jo@samaritans.org in the UK. In the US, call the Samaritans branch in your area or 1 (800) 273-TALK
The government will “mainline AI into the veins” of the UK, with plans being unveiled today by Sir Keir Starmer.
The prime minister is set to promise investment, jobs and economic growth due to a boom in the sector.
It comes as his government battles against allegations they are mismanaging the economy and stymied growth with the budget last autumn.
The government’s announcement claims that, if AI is “fully embraced”, it could bring £47bn to the economy every year.
And it says that £14bn is set to be invested by the private sector, bringing around 13,000 jobs.
The majority of those would be construction roles to build new data centres and other infrastructure, with a smaller number of technical jobs once the work is finished.
Sir Keir said: “Artificial Intelligence will drive incredible change in our country. From teachers personalising lessons, to supporting small businesses with their record-keeping, to speeding up planning applications, it has the potential to transform the lives of working people.
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“But the AI industry needs a government that is on their side, one that won’t sit back and let opportunities slip through its fingers. And in a world of fierce competition, we cannot stand by. We must move fast and take action to win the global race.”
The prime minister added that he wants Britain to be “the world leader” in AI.
The government announcement said: “Today’s plan mainlines AI into the veins of this enterprising nation.”
To achieve this, the government will implement all 50 recommendations made by Matt Clifford following his review last year.
This includes creating new AI “growth zones” – the first of which is set to be in Culham, Oxfordshire, where the UK’s Atomic Energy Authority is based.
These zones will get faster planning decisions and extra power infrastructure.
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4:53
Is the AI boom turning into a market bubble?
The government also wants to increase UK computing power 20-fold by 2030, including by building a brand-new supercomputer.
Labour cancelled a planned supercomputer when it entered office, as it claimed it wasn’t funded. The new venture is expected to be a joint public-private project.
The government says its plans will have three pillars. This includes laying the foundations with new AI growth zones and the new supercomputer.
The second is to boost AI take up by the public and private sectors. New pilots for AI in the public service are set to be announced, and Sir Keir has written to all cabinet ministers, telling them to drive AI adoption and growth.
And the third pillar is keeping ahead of the pack, with the government set to establish a “team” to keep the UK “at the forefront of emerging technology”.
The announcement was welcomed by a slew of technology bosses.
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Chris Lehane, the chief global affairs officer at OpenAI, which released ChatGPT, said: “The government’s AI action plan – led by the prime minister and [Science] Secretary Peter Kyle – recognises where AI development is headed and sets the UK on the right path to benefit from its growth.
“The UK has an enormous national resource in the talent of its people, institutions and businesses which together, can leverage AI to advance the country’s national interest.”
The shadow secretary for science, innovation and technology, Alan Mak, said: “Labour’s plan will not support the UK to become a tech and science superpower. They’re delivering analogue government in a digital age.
“Shaping a successful AI future requires investment, but in the six months leading up to this plan, Labour cut £1.3bn in funding for Britain’s first next-generation supercomputer and AI research whilst imposing a national insurance jobs tax that will cost business in the digital sector £1.66bn.
“AI does have the potential to transform public services, but Labour’s economic mismanagement and uninspiring plan will mean Britain is left behind.”