Federal prosecutors said on Wednesday that special counsel Robert Mueller’s office was subject to a Russian disinformation campaign that intended to discredit his investigation into the Kremlin’s meddling in the 2016 election.

The Kremlin-backed disinformation campaign that targeted Mueller’s office failed to gain any traction, however, as the contents of a fake trove of the special counsel’s files were immediately dismissed as largely fabricated by the reporter and researcher who received them.

The fake documents were sent to ThinkProgress reporter Casey Michel and independent disinformation researcher Josh Russell in November in direct messages from a Twitter account called @HackingRedstone. The messages’ sender claimed to be “anonymous hackers.”