A US government contractor has been arrested by the Federal Bureau of Investigation (FBI) over the alleged leak of classified defence information to a person who published sensitive material online.
The US Department of Justice identified the suspect as Ian A. Brinksman, 42, of Washington, DC. Authorities arrested him on Friday, 23 October, after searching his residence.
Brinksman faces a charge of unlawfully transmitting national defence information.
According to prosecutors, he accessed classified intelligence reports beyond his authorised duties and shared them with someone with whom he was romantically involved.
The individual allegedly runs a publication on Substack, an online publishing platform, and has published articles containing information derived from classified government assessments. Investigators said Brinksman previously held a top-secret security clearance that allowed him to access Sensitive Compartmented Information while working for a US government agency. He later worked as a systems integration developer for a private contractor serving the same agency.
US authorities allege that at least five articles published in 2026 contained information closely matching classified intelligence reports.
Assistant Attorney General for National Security John A. Eisenberg said Brinksman allegedly obtained sensitive material outside his authorised responsibilities and passed it to someone he knew intended to publish it.
Attorney General Todd Blanche said the Justice Department would continue to prosecute cases involving alleged leaks that threaten national security.
Meanwhile, FBI Director Kash Patel described protecting government secrets as a counterintelligence priority. He said people who abuse positions of trust and endanger national security would face prosecution. The FBI’s Chicago Field Office is leading the investigation, with support from its Washington Field Office. The Justice Department’s National Security Division and federal prosecutors are also handling the case.
The charge against Brinksman remains an allegation. He is presumed innocent unless proven guilty beyond a reasonable doubt in court.
