Jack Teixeira, a Massachusetts Air National Guard has been named as the suspect who leaked secret Pentagon documents.

He is currently wanted by the FBI for questioning after highly classified military documents on the Ukraine war were shared on a small online community on the platform Discord over the span of several months. The documents eventually were leaked beyond just the two dozen members on the platform to a larger Discord community, in March. Last week, they then migrated to 4chan, Twitter, and Russian Telegram channels.

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The documents, as reviewed by CBS News, contained sensitive information about the US supporting the Ukrainian government in its war with Russia. It also included an analysis of Ukraine’s air defenses and information about countries like South Korea.

Who is Jack Teixeira?

The New York Times has identified Jack Teixeira, who is a member of the intelligence wing of the Massachusetts Air National Guard.

He apparently oversaw a private group on Discord, known as Thug Shakers Central. Washington Post initially reported that the person who first shared the documents on that restricted group was known to fellow members as “OG.” The outlet confirmed that Teixeira has a military connection, but did not divulge his exact role.

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The Post reported that other members of the group said that OG was not motivated by politics or ideology. They also defended Teixeira and did not intend for the documents to be shared outside the Discord community, which was said to include about two dozen users.

A Pentagon spokesman told reporters that the disclosures present a “very serious risk to national security.” “While the FBI investigation continues and they haven’t officially named a suspect, whoever leaked this information will and should face serious criminal charges,” said Rep. Bill Keating, a member of the House Armed Services Committee.

The Justice Department opened an investigation to identify the person responsible.