"Certain non-sensitive discovery materials in the defense's possession appear to have been altered and disseminated as part of a disinformation campaign aimed (apparently) at discrediting ongoing investigations into Russian interference in the USA political system", the filing said.
"Mueller's court filing on Wednesday said the names and structure of folders containing the leaked files matched those used by Mueller's office when it shared the data, and that these had not been made public", The Guardian informs.
Prosecutors say self-described "hackers" published documents shared with the defense - and that the government consequently should be permitted to hold back information that might otherwise get revealed if shared.
The FBI also obtained evidence the account used to set up the file-sharing portal was registered by a user with an IP address in Russian Federation, prosecutors said.
Concord is being represented by the US law firm Reed Smith, and through discovery, Reed Smith lawyers were given access to about four million documents from Mueller's office, a lot of them marked sensitive.
Concord is controlled by Yevgeny Prigozhin, a wealthy businessman known as "Putin's chef" for his ties to Russian President Vladimir Putin.
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Authorities determined that the files matched tracking numbers made by the US government that were shared with Concord.
Prosecutors say the vast majority of the files released by the Twitter account were actually "junk material that has nothing to do with the case", and were included along with real files from the investigation in an attempt to discredit it. Trump has repeatedly slammed the Mueller investigation as a "witch hunt" and insisted there was "NO COLLUSION" with Russian Federation. Specifically, the Mueller team claims that the evidence in question "identifies uncharged individuals and entities that the government believes are continuing to engage in operations that interfere with lawful US government functions".
In previous court documents, prosecutors have said a federal grand jury continues to work on a matter related to Concord, suggesting that more indictments could come.
The United States is eagerly awaiting Robert Mueller's final report.
"Some of the files they sent along did appear legitimate and were some of the things we'd already seen on those fake Twitter or Facebook pages before", Michel said. Stone has pleaded not guilty.
Handing that information to Russians would allow their "country to learn of these techniques and adjust their conduct, thus undermining USA national security interests, including investigations into the conducts of these foreign actors", the filing said.