Special counsel Robert Mueller made an astounding accusation that the Russians had somehow obtained secret information in his investigation and leaked it to the press to undermine his credibility.

The claims were made in a filing on Wednesday in his investigation into Russian election interference and alleged collusion with the Trump campaign.

"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 U.S. political system," the filing said.

The filing further alleges that the information was promulgated on Twitter though an account identified as "@HackingRedstone."

The account has since been deactivated.

The filing cited a tweet from the account posted in October 2018 claiming to have obtained information from the Mueller investigation and posting them in a link so that the public can read them.

"We've got access to the Special Counsel Mueller's probe database as we hacked Russian server with info from the Russian troll case Concord LLC v. Mueller," the tweet read. "You can view all the files Mueller had about the IRA and Russia collusion. Enjoy the reading!"

Mueller's prosecutors said that there was strong evidence to conclude that the leaked information was from his investigation.

Here's CNN report about Mueller's claim: