Federal law enforcement is expected to arrest a 21-year-old Air National guardsman on Thursday who they suspect is involved in the leak hundreds of classified documents from the Pentagon.

Multiple reports have identified the leaker as Jack Teixeira, a 21-year-old member of the intelligence wing of the Massachusetts Air National Guard, with his arrest to occur sometime later on Thursday.

The documents were reportedly leaked sometime in February in an invite-only chat on Discord, a chat server, according to a Washington Post report. However, Secretary of Defense Lloyd Austin said he was made aware of the leaked documents on April 6 and convened military officials for daily updates since April 7.

A number of the Pentagon documents suggested that U.S. intelligence penetrated the highest levels of the Russian military, including information from the Russian Defense Ministry outlining attacks against two separate Ukrainian troop positions.

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The Washington Examiner reached out to the Justice Department for confirmation on the identity of the leaker and the impending arrest.