By AFP

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FBI agents on Thursday arrested a 21-year-old national guardsman suspected of being behind a major leak of sensitive US government secrets, including about the Ukraine war.

Read: How President Biden got to Ukraine

Broadcasted live on TV networks, the dramatic arrest was the culmination of a weeklong investigation fuelled by intense media coverage into one of the most damaging leaks of classified information since the 2013 dump of National Security Agency documents by Edward Snowden.

Addressing a news briefing, US Attorney General Merrick Garland named the suspect as Jack Teixeira, an employee of the US Air Force National Guard and the reported leader of the online chat group where the document trove first emerged.

This photo illustration created on April 13, 2023, shows the US government leaks suspect, national guardsman Jack Teixeira reflected in an image of the Pentagon in Washington, DC. PHOTO | STEFANI REYNOLDS | AFP

“The FBI arrests Teixeira in connection with an investigation into alleged unauthorized removal, retention and transmission of classified US National Defence information,” Garland said. 

News footage of the operation in the Southern Massachusetts town of North Dighton showed the suspect dressed in red shorts and a t-shirt with his hands behind his head, backing slowly toward rifle-armed camouflage-clad law enforcement personnel who took him into custody.

Police in the small town in the north-eastern state sought to reassure the community about the heavy law enforcement presence, saying in a statement that there was ‘no threat to public safety’.

The US National Guard Bureau said Teixeira was enlisted in September 2019 as an IT and communications specialist who reached the rank of airman first class, the third lowest for air force personnel.

He was expected to make an initial appearance in a Massachusetts federal court as early as Friday.

Evidence points to Teixeira

US Defence Secretary Lloyd Austin issued a statement praising the Justice Department and FBI for their swift arrest in connection with this investigation.

Austin added that he is ordering a review of our intelligence access, accountability and control procedures within the country’s defence department to inform our efforts to prevent this kind of incident from happening again.

Teixeira's arrest came a day after The Washington Post reported that hundreds of pages of documents had been posted on the social media platform Discord by a man who worked on a US military base.

According to The New York Times, a trail of digital evidence pointed to Teixeira as the leader of the private group on Discord called Thug Shaker Central, where the documents surfaced.

The embarrassing security breach which included top secret documents has revealed US unease over the viability of a coming counteroffensive by Kyiv's forces against Russian troops as well as concerns about Ukrainian air defences and pointed to US spying on allies including Israel and South Korea.

Read: Biden vows Ukraine to prevail in war with Russia

US President Joe Biden addressed the leak earlier on Thursday during his visit to Ireland, saying he was pleased the country’s federal authorities were getting close to identifying the source.

US President Joe Biden. PHOTO | DREW ANGERER | GETTY IMAGES VIA AFP

The white house said Biden was later briefed on the arrest.

Nicknamed ‘OG’ on Discord

The alleged leaker reportedly went by the nickname ‘OG’ and regularly posted documents in the chat group in question for months.

The group of around 24 people including some from Russia and Ukraine bonded over their ‘mutual love of guns, military gear and God’, and formed an ‘invitation-only clubhouse in 2020 on Discord’, reported the Post which like the Times cited unidentified members of Thug Shaker Central.

“OG told the group members that he spent some of his day inside a secure facility that prohibited cell phones and other electronic devices," the Post report said.

“He first wrote down the contents of classified documents to share with the group but later began taking photos, telling other members not to share them,” the newspaper reported.

“OG had a ‘dark view’ of the US government and spoke of the country and particularly, law enforcement and the intelligence community as a sinister force that sought to suppress its citizens and keep them in the dark," the Post said citing one of the group's members.

A Discord spokesperson told AFP that user safety is a priority and that content violating its policies can result in people being banned, servers being shut down and police alerted.

"In regard to the apparent breach of classified material, we are cooperating with law enforcement," the spokesperson said.

"As this remains an active investigation, we cannot provide further comment at this time," he added.