A foreign hacker compromised files relating to the FBI’s investigation of the late sex offender Jeffrey Epstein during a break-in at the bureau’s New York Field Office three years ago, according to ​a source familiar with the matter and recently published Justice Department documents reviewed by Reuters.

The details of who accessed a server at the FBI’s New York Field Office, ‌including the allegation that a foreign hacker was involved, are being reported here for the first time.

In a statement, the FBI said what it described as a “cyber incident” was “an isolated one”.

“The FBI restricted access to the malicious actor and rectified the network. The investigation remains ongoing, so we do not have further comments to provide at this time.”

Although the source said the intrusion appeared to have been carried out by a cybercriminal rather than a foreign government, ​the incident underscores the files’ potential intelligence value, one academic said.

The legally mandated publication of US Justice Department documents has exposed the dead financier’s ties to prominent people in politics, finance, academia and business, ​triggering investigations in numerous countries around the world.

“Who wouldn’t be going after the Epstein files if you’re the Russians or somebody interested in kompromat?” said ⁠Jon Lindsay, who researches the role of emerging technology in global security at the Georgia Institute of Technology.

“If foreign intelligence agencies are not thinking seriously about the Epstein files as a target, then ​I would be shocked.”

The breach was reported contemporaneously by CNN and Reuters on Feb 17, 2023; the connection to Epstein materials was made by the French magazine Marianne.

Epstein, a longtime associate of US President Donald Trump, ​pleaded guilty in 2008 to prostitution charges, including soliciting an underage girl. He was found hanged in his jail cell in 2019, in what was ruled a suicide, after being arrested again on federal charges of sex trafficking of minors.

February 2023 break-in

The hack occurred after a server at the Child Exploitation Forensic Lab in the FBI’s New York Field Office was inadvertently left vulnerable by Special Agent Aaron Spivack, who was trying to navigate the bureau’s complex ​procedures for handling digital evidence, according to the source and the documents.

A timeline written by Spivack and included in the large cache of Epstein documents released earlier this year said the break-in happened ​on February 12, 2023.

It was discovered the following day when Spivack turned on his computer and discovered a text file warning him that his network had been compromised, according to that document.

Further investigation turned up traces ‌of unusual activity ⁠on the server, the document said, adding that the activity “included combing through certain files pertaining to the Epstein investigation”.

The timeline does not say which specific files were accessed, whether the hacker downloaded the data, or who the hacker was. Reuters could not establish what, if any, overlap the affected data had with the Epstein documents published earlier this year or the files that remain under wraps.