The Massachusetts Air National guardsman accused of leaking highly classified military documents kept an arsenal of guns, talked of “violence and murder” on a social media platform and an “assassination van,” prosecutors wrote ahead of Thursday’s hearing for 21-year-old Jack Teixeira.

The court filings raise new questions about why Teixeira had such a high security clearance and access to some of the nation’s most classified secrets. They said he may still have material that hasn’t been released, which could be of “tremendous value to hostile nation states that could offer him safe harbor and attempt to facilitate his escape from the United States.”

Late Wednesday, the Air Force announced it suspended the commander of the 102nd Intelligence Support Squadron where Teixeira worked and the administrative commander “overseeing the support for the unit mobilized under federal orders,” pending further investigation. It also temporarily removed each leader’s access to classified systems and information.

Court papers urging a federal judge to keep Teixeira in custody detailed a troubling history going back to high school, where he was suspended when a classmate overheard him discussing Molotov cocktails and other weapons and racial threats. More recently, prosecutors said, he used his government computer to research past mass shootings and high-profile standoffs with federal agents.

He remains a grave threat to national security and a flight risk, prosecutors wrote, and investigators are still trying to determine whether he kept any physical or digital copies of classified information, including files that haven’t already surfaced publicly.

“There simply is no condition or combination of conditions that can ensure the Defendant will not further disclose additional information still in his knowledge or possession,” prosecutors wrote. “The damage the Defendant has already caused to the U.S. national security is immense. The damage the Defendant is still capable of causing is extraordinary.”

Teixeira has been in jail since his arrest earlier this month on charges stemming from the highest-profile intelligence leak in years.

Teixeira has been charged under the Espionage Act with unauthorized retention and transmission of classified national defense information. He has not yet entered a plea.

His lawyers are urging the judge to release him from jail, arguing in court papers filed Thursday that appropriate conditions can be set even if the court finds him to be a flight risk — such as confinement his father’s home and location monitoring.

The defense said Teixeira no longer has access to any top-secret information and accused prosecutors of providing “little more than speculation that a foreign adversary will seduce Mr. Teixeira and orchestrate his clandestine escape from the United States.”

“The government’s allegations … offer no support that Mr. Teixeira currently, or ever, intended any information purportedly to the private social media server to be widely disseminated,” they wrote. “Thus, its argument that Mr. Teixeira will continue to release information or destroy evidence if not detained rings hollow.”

He is accused of distributing highly classified documents about top national security issues in a chat room on Discord, a social media platform that started as a hangout for gamers. The leak stunned military officials, sparked international uproar and raised fresh questions about America’s ability to safeguard its secrets.

Prosecutors wrote that Teixeira, who owned multiple guns, repeatedly had “detailed and troubling discussions about violence and murder” on the platform where authorities say he shared the documents. In February, he told another person that he was tempted to make a minivan into an “assassination van,” prosecutors wrote.

The Justice Department’s filing outlines a pattern of troubling behavior that officials say began well before he entered the military and continued in recent months, even as his position afforded him access to government secrets.

In 2018, prosecutors allege, Teixeira was suspended after a classmate “overheard him make remarks about weapons, including Molotov cocktails, guns at the school, and racial threats.” His initial application for a firearms identification card that same year was denied due to police department concerns over those remarks.

He applied again over the next two years, and cited in his 2020 application after joining the Guard “his position of trust in the United States government as a reason he could be trusted to possess a firearm,” prosecutors wrote.

The Justice Department said that it has also learned through its investigation that Teixeira last July used his government computer to look up a series of U.S. mass shooting incidents and government standoffs, including the terms “Ruby Ridge,” “Las Vegas shooting,” “Mandalay Bay shooting,” “Uvalde” and “Buffalo tops shooting” — an apparent reference to the 2022 racist mass shooting at a Buffalo supermarket.

The searches of mass shootings on a government computer should have triggered the computer to generate an immediate referral to security, which could have then led to a more in depth review of Teixeira’s file, according to Dan Meyer, a lawyer who specializes in military, federal employment and security clearance issues. The Air Force’s investigation will likely discover whether a referral was generated — and whether security officers did anything with the information.

Teixeira’s lawyers noted that he has no criminal history and would have no access to guns if he was released. The incident at his high school was “thoroughly investigated” and he was allowed to come back after a few days and a professional psychological evaluation, they wrote. That investigation was “fully known and vetted ” by the Air National Guard before he enlisted and when he obtained his top secret security clearance, they said.

Months later, after news outlets began reporting on the documents leak, Teixeira took steps to destroy evidence after news outlets began reporting on the documents leak. Authorities who searched a dumpster at his home found a smashed laptop, tablet and Xbox gaming console, they said.

The leaked documents appear to detail U.S. and NATO aid to Ukraine and U.S. intelligence assessments regarding U.S. allies that could strain ties with those nations. Some show real-time details from February and March of Ukraine’s and Russia’s battlefield positions and precise numbers of battlefield gear lost and newly flowing into Ukraine from its allies.

Authorities have not alleged a motive. Members of the Discord group have described Teixeira as someone looking to show off, rather than being motivated by a desire to inform the public about U.S. military operations or to influence American policy.

Billing records the FBI obtained from Discord were among the things that led authorities to Teixeira, who enlisted in the Air National Guard in September 2019. A Discord user told the FBI that a username linked to Teixeira began posting what appeared to be classified information roughly in December.

Teixeira was detected on April 6 — the day The New York Times first published a story about the breach of documents — searching for the word “leak” in a classified system, according to court papers. The FBI says that was reason to believe Teixeira was trying to find information about the investigation into who was responsible for the leaks.

(AP)