Finance ministers, central bankers and financiers have expressed serious concerns about a powerful new artificial intelligence (AI) model that could undermine the security of financial systems.

The development of the Claude Mythos model by Anthropic has led to crisis meetings, after it found vulnerabilities in every major operating system and browser.

Experts have warned that the model potentially has an unprecedented ability to identify and exploit cybersecurity weaknesses.

The Canadian finance minister François-Philippe Champagne told the BBC that Mythos had been discussed extensively by his peers at the key International Monetary Fund (IMF) meeting in Washington DC this week.

“Certainly it is serious enough to warrant the attention of all the finance ministers… The difference with the Strait of Hormuz is that we know where it is and we know how large it is. The issue that we’re facing with Anthropic is that it’s an unknown, unknown.

It requires a lot of attention so that we have safeguards, and we have processes in place to make sure that we ensure the resiliency of our financial system”.

Top bankers are to be given access to the model in advance to test out their systems.

The chief executive of Barclays CS Venkatakrishnan told the BBC: “it’s serious enough that people have to worry. We have to understand it better, and we have to understand the vulnerabilities that are being exposed and fix them quickly”.

He added that “this is what the new world is going to be” referencing a much more connected financial system, with both opportunities and vulnerabilities.

While developer Anthropic has said the model has already exposed multiple security vulnerabilities in some critical operating systems, financial systems and web browsers, governments and banks are being offered access in advance of its public release to help protect their own systems.

Bank of England Governor Andrew Bailey also told the BBC the development had to be taken very seriously: “we are having to look very carefully now what this latest AI development could mean for the risk of cyber crime.

There is a development of AI, of modelling, which makes it easier to detect existing vulnerabilities in, sort of core IT systems, and then obviously cyber criminals that the bad actors could seek to exploit them.”

The US Treasury confirmed it had raised the issue with its major banks encouraging them to test out their systems, before any public release of Mythos by Anthropic.

Financial industry sources indicated that another prominent US AI company could soon release a similarly powerful model but without the same safeguards.

• Listen: The AI model that’s ‘too powerful’ to be released to the public

US President Donald Trump has announced that the leaders of Israel and Lebanon have agreed to a 10-day ceasefire, which took effect from 17:00 EST (21:00 GMT; midnight local time) on 16 April.

There was no mention in Trump’s statement of Hezbollah, the Iran-backed militant group in Lebanon, with which Israel has been exchanging fire for the past six weeks. But in a later post on Truth Social, Trump urged the group to abide by the ceasefire, saying, “I hope Hezbollah acts nicely and well during this important period of time.”

Following the announcement, the US president also invited Israeli Prime Minister Benjamin Netanyahu and Lebanese President Joseph Aoun to the White House for further talks.

Here is what we know about the truce.

The terms of the deal specify that the ceasefire is set to last 10 days, with the possibility it being “extended by mutual agreement” if negotiations show signs of progress.

According to further details provided by the US State Department:

• Israel retains its “right to take all necessary measures in self-defence, at any time, against planned, imminent, or ongoing attacks”
• Lebanon must take “meaningful steps” to prevent Hezbollah and all other “rogue non-state armed groups” from carrying attacks against Israeli targets
• Those involved recognise that Lebanon’s security forces have exclusive responsibility for Lebanon’s security
• Israel and Lebanon requested that the US continues to facilitate further direct talks with the objective of “resolving all remaining issues”

The statement added that the truce was a “gesture of goodwill” by Israel intended to enable “good-faith negotiations towards a permanent security and peace agreement” between the two parties.

Israel and Lebanon’s leaders have both welcomed the truce, with Netanyahu calling it an “opportunity to make a historic peace agreement”.

Lebanese Prime Minister Nawaf Salam said he hopes the agreement will allow those have been displaced by the conflict to return to their homes.

Hezbollah have also signalled a willingness to participate in the ceasefire, but said it must include “a comprehensive halt to attacks” across Lebanon and “no freedom of movement for Israeli forces”.

The Iran-backed group, while deeply embedded in Lebanon, is not part of the Lebanese government’s security apparatus.

Iran’s foreign ministry welcomed the ceasefire, with spokesperson Esmail Baghaei expressing his “solidarity” with Lebanon. Tehran had insisted that its own two-week ceasefire with the US should include Lebanon while the US and Israel said it did not.

UN Secretary General António Guterres commended the role of the US in facilitating the ceasefire, and urged all parties to “fully respect” and “comply with international law at all times”.

President of the European Commission Ursula von ​der Leyen called the deal a “relief”, saying Europe will continue to “call for the full respect of Lebanon’s sovereignty and territorial integrity”.

EU foreign policy chief Kaja Kallas added that the ceasefire must be used to “step back from the violence” and create space for talks for “a more lasting peace”.

Despite the agreement, Netanyahu said Israeli troops would maintain a 10km-deep (6.2 mile) “security zone” in southern Lebanon, saying: “We are there, and we are not leaving.”

He added that the buffer zone needed to remain to “block the danger of invasion”.

Israel re-entered southern Lebanon after strikes by Hezbollah in early March, creating a buffer zone it said was necessary to protect communities in northern Israel.

A previous ceasefire deal between Israel and Hezbollah – ending 13 months of conflict – still saw near-daily cross-border strikes.

Israel and Lebanon held rare direct talks in Washington earlier this week week aimed at easing the war, which has seen deadly air strikes on part of the Lebanese capital of Beirut and fighting in the country’s south.

Trump’s announcement said the deal came about after “excellent conversations” with Aoun and Netanyahu, but did not mention whether Hezbollah was directly involved in the talks.

He later urged Hezbollah to “act nicely and well during this important period of time” on social media.

Netanyahu, while welcoming the truce, also made clear also made clear that he was making few concessions on the ground.

He said Hezbollah had insisted on two conditions: the withdrawal of Israeli forces from Lebanon, and a principle of “quiet for quiet”.

However, it appears ceasefire announcement has taken Israel by surprise – reportedly even within the government’s own security cabinet.

A widely respected Israeli news outlet tonight described Netanyahu convening a security cabinet meeting with just five minutes notice, shortly before the ceasefire announcement was made.

Leaks from that meeting say ministers were not given a vote on the ceasefire.

When the ceasefire with Iran was announced, there were mixed messages on whether Lebanon was involved. Pakistani officials, who helped negotiate the deal, and Iranian officials, said it was, but Israel said it was not. US President Donald Trump’s press secretary Karoline Leavitt also later said Lebanon was not part of the deal.

Israel launched strikes on Lebanon on 2 March in response to strikes launched by Hezbollah. This was after the US and Israel launched strikes on Iran – prompting retaliation from Tehran against US allies in the Gulf, and from Iran’s proxies, which includes the Lebanese militant group.

Israel and Hezbollah have continued to exchange fire since then, despite pleas from Lebanon’s Prime Minister for both sides to stop doing so.

More than 2,100 people have been killed and 7,000 others wounded in Israel’s attacks on Lebanon since 2 March, according to the country’s health ministry, which does not distinguish between combatants and civilians. The number includes at least 260 women and 172 children. The ministry says 91 health professionals have been killed and 208 other wounded in the war, with more than 120 Israeli attacks recorded on ambulances and medical facilities. BBC Verify analysis found more than 1,400 buildings in Lebanon had also been destroyed.

Hezbollah attacks have killed two civilians in Israel over the same period, while 13 Israeli soldiers have been killed in combat in Lebanon, Israeli authorities say.

On Thursday, the Israeli military destroyed the last bridge linking the south to the rest of the country, further isolating the region and renewing fears among many Lebanese that this could lead to a long-term occupation of some areas.

US singer D4vd has been arrested on suspicion of murdering a teenage girl who went missing last year, police say.

The TikTok star, whose legal name is David Anthony Burke, was the target of a grand jury investigation into the apparent murder of Celeste Rivas Hernandez, whose remains were found in his Tesla in September.

The Los Angeles Police Department said on Thursday that the 21-year-old was being held without bail and the case will be presented to the District Attorney’s office on Monday.

The singer has been virtually silent on the case but his representatives previously said he was cooperating with authorities. The BBC has contacted his representatives about the arrest.

Police said on Thursday they had arrested Burke “for the murder of Celeste Rivas”.

Questions had been mounting since the 8 September discovery of the 14-year-old’s remains in a Hollywood tow yard after authorities received reports of a foul odour coming from the vehicle.

On 8 September 2025, investigators found her decomposed head and torso in a cadaver bag in the front boot of a Tesla car registered to D4vd’s address in Texas, court documents said.

The county’s medical examiner said the body was “severely decomposed” and deferred on making a ruling on how she died pending the death investigation. The girl might have been dead “for several weeks” before the discovery of her body, officials said.

No cause of death in the teen’s case has been announced, with authorities only saying for months that they were treating the case as a death investigation.

A judge ordered that the teen’s death records be sealed in November to ensure officers received information from the medical examiner before the public.

Rivas Hernandez – who lived about 75 miles (120km) away from where her body was discovered – had last been reported missing by her family in April 2024, but it was not the first time she had run away from their Lake Elsinore home. A first-generation daughter of immigrant parents from El Salvador, neighbours recognised her as a girl who would visit the corner store almost daily to buy candy and soda, according to the Los Angeles Times.

The lack of information in the macabre death has fuelled intrigue and ignited an online following, with many hypothesising about the girl’s connection to the Romantic Homicide singer.

A grand jury began hearing evidence in the case in December, but D4vd’s arrest on Thursday marks the first significant development in the case in months.

More details about the case emerged in court filings after the singer’s family was summoned from Texas by a California court to testify before the grand jury.

When Dawud Burke, D4vd’s father, fought against the summons in a Texas court he included material from the California case that had not been previously available to the public.

The filings, obtained by the BBC, confirmed that D4vd had been identified as a “target” of a grand jury investigation in Los Angeles and that he may be subject to proceedings for one count of murder.