Chinese state-linked hackers breached mobile phones at "the heart of Downing Street" amid a global cyber-espionage campaign over several years targeting telecommunication networks, according to reports.

U.S. officials first alerted its allies in 2024 after finding out that hacking groups had gained access to telecom companies around the world, according to The Associated Press.

The campaign reportedly targeted multiple countries, including the U.S. and the other members of the Five Eyes intelligence alliance: Australia, Canada and New Zealand.

The breaches allegedly gave China access to the phone data of millions and the possible ability to eavesdrop on calls, read text messages and track users’ locations.

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The hackers also had the ability to record calls "at will" according to Anne Neuberger, who was a deputy U.S. national security adviser between January 2021 and January 2025, The Telegraph reported.

Neuberger said that the "Chinese gained access to networks and essentially had broad and full access," giving them the capability to "geolocate millions of individuals, to record phone calls at will."

U.S. intelligence agencies believe the breaches date back to at least 2021, but they were only identified and disclosed by U.S. authorities in 2024.

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In 2024, The Associated Press reported that U.S. federal authorities urged telecommunication companies to boost network security. The guidance, issued by the FBI and the Cybersecurity and Infrastructure Security Agency, was to help root out the hackers and prevent similar attacks in the future.

A joint cybersecurity advisory was issued in August 2025, with the U.S. National Security Agency (NSA) and allied partners warning that Chinese state-sponsored actors were targeting networks globally.

"The malicious activity outlined in the advisory partially overlaps with cybersecurity industry reporting on Chinese state-sponsored threat actors referred to by names such as Salt Typhoon," an NSA release said.

In the U.K., officials raised concerns that senior government figures may also have been exposed. One source told The Telegraph that the breach went "right into the heart of Downing Street."

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Similarly, The Telegraph was told that there were "many" different hacking attacks on the phones of Downing Street staff and across wider government, especially when Rishi Sunak was prime minister between 2022 and 2024.

Yuval Wollman, a former Israeli intelligence chief, also told The Telegraph that Salt Typhoon was "one of the most prominent names" in the cyber-espionage world.

"While much of the public reporting has focused on U.S. targets, Salt Typhoon’s operations have extended into Europe, the Middle East and Africa, where it has targeted telecoms firms, government entities and technology companies," Wollman of cybersecurity platform CyberProof added.

In the past, China’s foreign ministry dismissed the claims as "baseless" and "lacking evidence," according to The Telegraph.

Fox News Digital has reached out to Downing Street for comment.

Social media companies have removed access to millions of accounts belonging to children in Australia in the first month since the country’s historic ban took effect, requiring platforms such as Instagram, Snapchat and TikTok to identify and deactivate users under the age 16.

Access was revoked for roughly 4.7 million users, according to Australian officials, who on Friday touted the early success of the law, which was enacted in mid-December amid fears surrounding the impact of online environments on young people.

"Today, we can announce that this is working," Prime Minister Anthony Albanese said during a news conference. "This is a source of Australian pride. This was world-leading legislation, but it is now being followed up around the world."

Under the law, 10 social media giants — Facebook, Instagram, X, TikTok, Snapchat, Kick, Reddit, Threads, Twitch and YouTube — must locate and deactivate accounts of Australian users under the age of 16. The companies face fines of up to $33 million if they don’t take "reasonable steps" to remove underage users.

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"We stared down everybody who said it couldn’t be done, some of the most powerful and rich companies in the world and their supporters," said Australian Communications Minister Anika Wells. "Now Australian parents can be confident that their kids can have their childhoods back."

According to Australia’s eSafety Commissioner Julie Inman Grant, there are roughly 2.5 million Australians between the ages of 8 and 15, with about 84% of 8- to 12-year-olds having at least one social media account. While the total number of accounts across platforms is unknown, Inman Grant said the number of deactivated or restricted accounts was encouraging.

"We’re preventing predatory social media companies from accessing our children," she said at a news conference.

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Critics of the new ban have argued that it will be difficult to enforce, and Inman Grant acknowledged that there are still some active underage accounts.

"We don't expect safety laws to eliminate every single breach. If we did, speed limits would have failed because people speed, drinking limits would have failed because, believe it or not, some kids do get access to alcohol," she said.

She added that based on data reviewed by her office, there was an increase in downloads of alternative apps after the ban began, but not a spike in usage.

Social media platforms can verify age by either requesting copies of identification documents, using a third party to apply age estimation technology to an account holder’s face, or making inferences from data already available, such as how long an account has been active.

Meta, which owns Facebook, Instagram and Threads, said earlier this week that it had removed nearly 550,000 accounts belonging to users it believed were under the age of 16 just one day after the ban began.

While the law was popular among parents and child safety campaigners, online privacy advocates and groups representing teenagers largely came out against it.

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Other countries have weighed similar measures in step with Australia, and some American lawmakers have also signaled their interest in pursuing social media restrictions in the U.S.

"I think we ought to look at what Australia’s doing, for example, requiring access to these social media platforms to not be available to anybody under the age of 16," Sen. John Cornyn, R-Texas, said last month.

Sen. Dick Durbin, D-Ill., previously said that "protecting children is an avenue that should be pursued."

"I won’t rule out some sort of limitation in sales or distribution or use of those devices… Parents and grandparents need a helping hand; this is getting out of hand," he said.

Fox News Digital's Nora Moriarty, The Associated Press and Reuters contributed to this report.

The British government intensified its crackdown on AI-generated sexual abuse Monday after ministers confirmed a possible ban on Elon Musk's social media platform X amid a widening probe and with the company potentially incurring hefty fines.

The dramatic move follows the launch of a formal investigation by Ofcom, the U.K. communications regulator, into whether X breached its legal duties under the U.K.'s Online Safety Act and came after reports that the platform’s built-in AI chatbot, Grok, was used to generate and share sexualized deepfake images of women and children.

Grok was launched in 2023 but its image generator feature, Grok Imagine, was added in 2025 with a specific mode to generate adult content.

Secretary of State for Science, Innovation and Technology Liz Kendall described the recent use of the AI tool being misused to generate sexually explicit and non-consensual images as "deeply disturbing." 

Kendall also warned that social media companies would be held accountable if they failed to act.

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"I welcome Ofcom’s urgency in launching a formal investigation today," Kendall said, according to Reuters. "It is vital that Ofcom complete this investigation swiftly because the public – and most importantly the victims – will not accept any delay."

In a separate statement shared later Monday, Kendall said the Grok AI tool had been used to create and circulate degrading, non-consensual intimate images.

"No woman or child should live in fear of having their image sexually manipulated by technology," she said before adding, "The content which has circulated on X is vile. It is not just an affront to decent society, it is illegal."

Kendall added that sharing or threatening to share deepfake intimate images without consent, including images of people in their underwear, constitutes a criminal offense under U.K. law.

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She warned that Ofcom has the authority to issue "fines worth millions of dollars" or penalties of up to 10% of a company’s qualifying worldwide revenue.

"But X does not have to wait for the Ofcom investigation to conclude," Kendall said. "They can choose to act sooner to ensure this abhorrent and illegal material cannot be shared on their platform," she warned.

Ofcom had said it "urgently made contact" with X on Jan. 5, demanding explanations about the steps being taken to protect U.K. users and setting a response deadline of Jan. 9.

While xAI, another company founded by Musk, responded, Ofcom said it decided to open a formal investigation after reviewing the available evidence "as a matter of the highest priority."

In a statement shared Monday, Ofcom said, "Reports of Grok being used to create and share illegal non-consensual intimate images and child sexual abuse material on X have been deeply concerning."

"Platforms must protect people in the UK from content that’s illegal in the UK, and we won’t hesitate to investigate where we suspect companies are failing in their duties, especially where there’s a risk of harm to children," the statement said.

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As previously reported by Fox News Digital, the chatbot acknowledged in a public post on X that it had generated and shared an AI image depicting two young girls in sexualized attire, calling the incident a "failure in safeguards" and apologizing for the harm caused.

Amid mounting criticism, Grok confirmed it has begun restricting some image-generation and editing features to paying subscribers. The chatbot said the limitations were implemented to prevent further misuse.

Musk also accused the U.K. Government of "fascism" Monday for "arresting thousands of people for social media posts."

The billionaire Tesla founder had responded to a post on X that claimed the country arrests more people for social media posts than "any other country on earth." 

Alongside the Ofcom investigation, the U.K. government announced that legislation criminalizing the creation of non-consensual intimate images generated by AI would come into force this week.

Kendall said responsibility does not rest solely with individuals.

"The platforms that host such material must be held accountable, including X," she said. 

If they do not act, she said she is "prepared to go further."

Meanwhile, U.K. Prime Minister Keir Starmer's official spokesperson said the government’s presence on the platform was "under review" and that "all options are on the table."

The Associated Press also reported Monday that Malaysia and Indonesia have become the first countries to block Grok.

Fox News Digital has reached out to Elon Musk and Prime Minister Keir Starmer's office for comment.

The Associated Press and Reuters contributed to this report.