The FBI has arrested Jack Douglas Teixeira, a 21-year-old member of the US Air National Guard, over the leaks online of classified documents that embarrassed Washington with allies around the world.
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Federal agents in an armoured car and military gear on Thursday swooped in on Teixeira, dressed in gym shorts, a T-shirt and trainers, at his home in Dighton, Massachusetts, south of Boston.
The arrest came a week after the leaks first became widely known, setting Washington on edge about the damage they might have caused.
The episode embarrassed the US by revealing its spying on allies and purported Ukrainian military vulnerabilities.
The leak of documents, posted largely on social media sites, was believed to be the most serious security breach since more than 700,000 documents, videos and diplomatic cables appeared on the WikiLeaks website in 2010.
Teixeira was an airman 1st class at Otis Air National Guard Base in Massachusetts, according to his service record.
He joined the Air National Guard in 2019 and worked as a "Cyber Transport Systems Journeyman", or an IT specialist.
Attorney-General Merrick Garland told reporters Teixeira was wanted "in connection with an investigation into alleged unauthorised removal, retention, and transmission of classified national defence information".
Aerial news video showed Teixeira with his hands laced behind his head, walking backward toward the armoured car with one officer watching from the turret.
He was handcuffed and placed in the back of the vehicle. Garland said he was taken into custody "without incident".
The Justice Department did not say what charges Teixeira would face, although they will likely involve criminal charges of wilfully retaining and transmitting national defence information.
Defense Secretary Lloyd Austin said a Pentagon task force had been "working around the clock to assess and mitigate any damage".
Teixeira is expected to appear in court on Friday.
A police roadblock on the way to the house where Teixeira was arrested kept neighbours away from their homes.
Eddy Souza, 22, said he grew up nearby and that he knew Jack Teixeira when both attended the same high school.
He said Teixeira had expressed no extremist sentiments when they were last in touch several years ago.
"He's a good kid, not a troublemaker, just a quiet guy," Souza said. "It sounds like it was a stupid kid's mistake."
Although the leak only garnered widespread attention after an April 6 story in the New York Times, journalists have found evidence that the documents - or at least some of them - had been floating around on social media as early as March or even January.
Bellingcat, the Washington Post and The New York Times traced the documents' earliest appearance to a defunct server on the instant messaging site Discord.
In a chat group on the site, Teixeira went by the handle OG and was admired by the group's mostly young members, who shared a love for guns and military gear.
The Justice Department opened a formal criminal probe last week after a referral from the Defense Department, which called the leak a "deliberate, criminal act".
Reuters has reviewed more than 50 of the documents, labelled "Secret" and "Top Secret" but has not independently verified their authenticity. The number of documents leaked is likely to be more than 100.
A number of countries have questioned the veracity of some of the leaked documents, including Britain, which said there was "a serious level of inaccuracy" in the information.
The leaks revealed information about allies including Israel, South Korea and Turkey.
US officials believe most of the materials are genuine. Some, however, appear to have been altered to show inflated estimates for Ukrainian battlefield casualties in the war with Russia as well as understated numbers for Russian forces.
Australian Associated Press
