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A member of the Massachusetts Air National Guard was arrested by the FBI on Thursday in connection with the leaking of classified documents that have been posted online, Attorney General Merrick Garland announced Thursday.

The arrest of Jack Teixeira, 21, comes following a fast-moving search by the US government for the identity of the leaker who posted classified documents to a social media platform popular with video gamers, CNN reports.

Teixeira was arrested in Massachusetts without incident, Garland said, and will be arraigned in federal court there. “This investigation is ongoing. We will share more information at the appropriate time,” the attorney general said, declining to answer questions.

Teixeira will first appear in court on Friday in Boston, according to the US attorney’s office there.

The FBI said in a statement that it took Teixeira into custody “at a residence in North Dighton, Massachusetts, for his alleged involvement in leaking classified U.S. government and military documents.”

“The FBI is continuing to conduct authorized law enforcement activity at the residence,” the agency said. “Since late last week the FBI has aggressively pursued investigative leads, and today’s arrest exemplifies our continued commitment to identifying, pursuing, and holding accountable those who betray our country’s trust and put our national security at risk.”

The leaked documents posted to social media, some of which have been obtained by CNN, included detailed intelligence assessments of allies and adversaries alike, including on the state of the war in Ukraine and the challenges Kyiv and Moscow face as the war appears stuck in a stalemate.