The FBI used billing records from an internet social media app to unmask US airman Jack Teixeira as a suspect over the leak of top-secret military documents, it has been revealed.
Court documents made public on Friday showed investigators identified the Massachusetts Air National Guardsman, 21, using information on the Discord chat platform.
The leak is believed to have started on its servers, which are frequently used by people who play online games.
Classified information is said to range from briefing slides mapping out military positions in Ukraineto consideration of what circumstances Russian President Vladimir Putin might use nuclear weapons.
Discord said it was cooperating with the bureau according to an FBI affidavit unsealed on Friday.
The document says the FBI interviewed an unnamed person familiar with Teixeira’s posts on Monday.
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Teixeira is said to be “at the heart” of a private channel called Thug Shaker Central, allegedly posting about guns, games, jokes and memes, people who say they chatted with him have claimed.
The anonymous person told the FBI a username linked to Teixeira began posting what appeared to be classified information last December.
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Moment suspected files leaker arrested
Image: A court sketch of Jack Teixeira appearing before a federal judge in Boston, Massachusetts, on Friday Pic: REUTERS
The affidavit suggests Teixeira had been typing out documents in his possession but started taking them home and photographing them after becoming “concerned he may be discovered making the transcriptions in the workplace”.
However, others said the user, nicknamed “the O.G” – also known as “original” or a way to describe someone who is the founder or influential in a group – had been posting documents he said were classified in the group for months.
The O.G started posting images of documents because they were annoyed others were not taking them seriously, it is alleged.
Image: Leaked Pentagon documents include a map that appears to detail the movement of Russian troops in Ukraine
Teixeira was detected on 6 April, according to the affidavit – the same day the New York Times first published a story about the classified documents being leaked.
He was arrested on Thursday by heavily armed tactical agents after a week-long investigation into the disclosure of the highly sensitive government records.
Image: A federal police vehicle parked outside the U.S District Court in Boston, Massachusetts Pic: AP
Image: Relatives of Teixeira leaving the federal courthouse after his appearance Pic: REUTERS
Family members sob during court appearance
The 21-year-old appeared before a federal magistrate judge at a court in Boston on Friday, charged with possessing unclassified documents pertaining to national security and possessing national defence materials.
Family members were seen crying and consoling each other before the defendant was brought into the court room.
Wearing a brown jumpsuit, he was ushered into the court by US marshals.
The judge ordered him to remain behind bars until a detention hearing on 19 April.
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Leaked documents ’embarrassing’ for US
The leaked documents have not been individually authenticated by officials.
A US Defence Department official said Teixeira could have had a higher level of security clearance due to being an information technology specialist responsible for military communications networks.
The Pentagon will now conduct a review of its intelligence access, accountability and control procedures to prevent such a leak from happening again, said US Defence Secretary Lloyd Austin.
Volodymyr Zelenskyy has called for a “clear position” from Donald Trump to stop Vladimir Putin and end the war in Ukraine.
In an exclusive interview with Sky News’ lead world presenter Yalda Hakim, the Ukrainian president said the only way for the fighting to stop was for defined security guarantees to first be put in place.
And that, he said, could only come if Mr Trump was bold.
He told Sky News he hopes UK Prime Minister Sir Keir Starmerwould drill into the detail of securing Ukraine’s future with the president during his state visit to Britain this week.
He said: “I very much hope he (Starmer) will be able to have a very specific discussion on the security guarantees of the US for Ukraine.
“Before we end the war, I really want to have all the agreements in place. I want to… have a document that is supported by the US and all European partners. This is very important.
“To make this happen, we need a clear position of President Trump.”
Image: Zelenskyy and Trump have endured a sometimes testy relationship. Pic: Reuters
“I believe that the US is strong enough to take decisions of their own,” he said. “I believe Donald Trump can give us air defence systems in quantity and US has enough.
“I’m sure the US can apply enough sanctions in order to hurt the Russian economy, plus Donald Trump has enough force to make Putin afraid of him.
“Europe has already introduced 18 sanctions packages against Russia. And all that’s lacking now is a strong sanctions package from the US.”
As news broke that British fighter jets were flying air defence missions over Poland after a Russian drone incursion, Hakim asked the Ukrainian leader what message he thought Putin was sending to Europeans.
“He’s testing NATO,” he said. “He wants to see what NATO is ready for, what they’re capable of, both diplomatically and politically, and how the local population will respond to this.”
“Also, in my opinion, the other message they are sending is, ‘don’t you dare to give Ukraine additional air defence systems, because you might need them yourself.'”
Bristling with frustration – Zelenskyy’s message is clear
Ukraine’s president has a very clear message for Trump – you alone have the power to stop Putin, and the time to act is now.
Meeting with me in Kyiv on the eve of the US president’s state visit to Britain, Zelenskyy bristled with frustration at the failure of the Western powers to ramp up pressure on the Kremlin, even as the Russians escalated their attacks on Ukraine.
Asked if the summit between Trump and Putin in Alaska has proven a mistake, he responded without hesitation that Putin is clearly not paying a price for his actions.
Zelenskyy believes Trump is reluctant to put pressure on Putin because it might jeopardise attempts to end the war.
But the Ukrainian leader argues this isn’t the way to handle the Russian president.
Zelenskyy also argued Trump’s emphasis on getting the Europeans to ratchet up economic pressure – foremost by stopping their purchases of Russian energy and tariffing other buyers like China and India – was understandable, but that the world’s sole superpower shouldn’t wait for others to act.
Trump has called on EU countries to end all Russian oil and gas purchases – and only then will he consider imposing sanctions on Russia.
He and First Lady Melania will stay at Windsor Castle and be treated to a flypast by the Red Arrows as well as UK and US F-35 military jets on the east lawn, and a special Beating Retreat military ceremony.
They will also visit Chequers, the prime minister’s official country residence in Buckinghamshire, though details of what they will discuss – and whether it will include the situation in Ukraine – have not been revealed.
Ukraine’s president has a very clear message for Donald Trump – you alone have the power to stop Vladimir Putin, and the time to act is now.
Meeting with me in Kyiv on the eve of the US president’s state visit to Britain, Volodymyr Zelenskyy bristled with frustration at the failure of the Western powers to ramp up pressure on the Kremlin, even as the Russians escalated their attacks on Ukraine.
“He should have received a setback in this war and stop. Instead, he received de-isolation,” he said.
“He definitely wants to trick the US. He is doing everything he can to avoid sanctions, to prevent the US and Trump from putting sanctions on him.”
Image: Donald Trump and Vladimir Putin in Alaska last month. Pic: Reuters
Zelenskyy believes Trump is reluctant to put pressure on Putin because it might jeopardise attempts to end the war.
But the Ukrainian leader argues this isn’t the way to handle the Russian president: “He understands force. That’s his language. That’s the language he understands. He doesn’t speak many languages, but that’s the language of force he understands – just like Russian, you know, his mother tongue.”
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Zelenskyy also argued Trump’s emphasis on getting the Europeans to ratchet up economic pressure – foremost by stopping their purchases of Russian energy, and by putting tariffs on other buyers like China and India – was understandable, but that the world’s superpower shouldn’t wait for others to act.
Trump has called on EU countries to end all Russian oil and gas purchases, and only then will he consider imposing sanctions on Russia.
“I think the US is strong enough on its own,” Zelenskyy said.
“They can make this happen quicker and all that’s lacking now is a strong sanctions package from the US.”
At times, the sound of these military drills was deafening.
There were fighter jets screaming overhead, air strikes on “enemy” forces, and tracer rounds from artillery units pounding out of the barrels.
Fireballs and mushroom clouds would periodically appear far off on the landscape, followed by a sudden explosive thud several seconds later.
I was watching from the safety of a viewing platform, along with other members of the international media.
But even at that distance, the various blasts were still powerful enough to reverberate through me.
Image: Russian troops load an Iskander missile onto a mobile launcher. Pic: Russian Defense Ministry Press Service via AP
This was the fourth day of ‘Zapad-2025’ – the joint military drills Russia holds with Belarus roughly every four years.
It took place at a training ground near the city of Borisov in Belarus, 150km from the Lithuanian border.
Moscow and Minsk insist the exercises are “defensive”. In this case, they said they were gaming out how they would respond to an attack by a NATO member.
But as I watched, I couldn’t help feeling that the training aspect was only one part of it.
The other part felt like theatre – a show of strength designed to intimidate those watching across the border on Europe’s eastern flank.
Image: A helicopter gunship. Pic: AP
The drills were smaller than previous years, most likely because Russia still needs its troops and equipment at the front in Ukraine.
But it still felt like Moscow was trying to send a message here – that despite the costs and casualties incurred fighting Kyiv, it’s still a force to be reckoned with.
For Belarus’s neighbours, these are anxious times. The last Zapad drills in 2021 were used as a springboard for Russia’s invasion of Ukraine a few months later. And so this time, Poland has closed its border, and like Lithuania, it’s holding military drills of its own.
Image: A ground drone drives through the training ground. Pic: AP
Afterwards, I tried to catch up with some of the defence dignitaries from foreign militaries, who had been invited to observe the drills. I wanted to see what they made of the show.
“A very good demonstration,” a senior officer from Pakistan told me, declining to give his name.
“It gives us an insight of how war is being fought, with new technologies, in this part of the world.”
But what about Poland’s concerns?
“Are they right to be nervous?” I asked. “Would you be nervous if you were next door?”
“Why would I be nervous?” he replied. “Being Pakistani, I know what I’m capable of. So I shouldn’t be nervous by somebody else doing exercises.”
“So NATO has no need to worry?” I continued.
“No, I don’t think so. NATO shouldn’t be worried.”
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There were actually some representatives from NATO members among the observers.
Delegations from Hungary and Turkey are no surprise – both countries have good relations with Moscow – but a team from the United States did raise eyebrows.
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Russia getting ‘ready for war with NATO’
A further sign, it seems, that the Trump administration is seeking to build bridges with the Kremlin, despite the lack of progress towards a Russia-Ukraine peace deal.
Unfortunately, none of those officials would answer my questions. Wary, perhaps, of sticking their head above the parapet, as the alliance seeks to present a united front.