An internal Air Force report released  Monday revealed that 15 members of the Air National Guard have been disciplined following an inquiry into airman Jack Teixeira, accused of posting a cache of classified military documents online, according to reports.

The Air Force filed its internal report with Congress Monday, according to the Washington Post, which first reported the development.

The Massachusetts Air National Guardsman is accused of sharing more than 40 images of classified documents largely regarding the war in Ukraine to the roughly 50 members of a Discord server he led. A “server” is what the gaming-dominated social media platform Discord calls individual groups or forums.

The Air Force investigation determined that Teixeira likely smuggled the documents and posted them online on his own, but also found that other personnel, “had information about as many as four separate instances of his questionable activity,” according to the Washington Post.

“After interviewing higher levels of the supervisory chain, it appears knowledge of these security incidents was not fully disclosed above the squadron level,” The Air Force Inspector General’s summary reads in part, according to the newspaper.

The 15 service members disciplined range in rank from staff sergeant to colonel. Some personnel were removed from their positions, others were subject to nonjudicial administrative actions, according to the Air Force, as reported by the Post.

The criminal case pending against Teixeira is due for a status conference by telephone Monday.

Teixeira was arrested April 13 at the North Dighton home of one of his parents and was charged with two counts: unauthorized removal and transmission of national defense information and unauthorized removal and retention of classified documents or materials. He was ordered held, where he remains despite the defense’s persistent appeals to the order.

He was indicted June 15 on six counts of willful retention and transmission of classified information relating to national defense. He pleaded not guilty to the charges in federal court in Worcester six days later.