Special counsel Robert Mueller filed a motion on Tuesday warning that Russian intelligence is attempting to influence the U.S. 2018 midterm elections, reported Politico.

According a court filing with a federal judge in Washington, the Mueller team wrote: “Public or unauthorized disclosure of this case’s discovery would result in the release of information that would assist foreign intelligence services, particularly those of the Russian Federation, and other foreign actors in future operations against the United States.”

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The motion continued: “The substance of the government’s evidence identifies uncharged individuals and entities that the government believes are continuing to engage in interference operations like those charged in the present indictment.”

His team did not offer any specific details regrading meddling. However, in the court filing on Tuesday, his team aimed to stop former Russian intelligence, that meddled in 2016 U.S. presidential election from securing any more information.

“Information within this case’s discovery identifies, sources, methods, and techniques used to identify the foreign actors behind these interference operations,” prosecutors wrote. “And disclosure of such information will allow foreign actors to learn of these techniques and adjust their conduct, thus undermining ongoing and future national security investigations. The government has particularized concerns about discovery in this case being disclosed to Russian intelligence services.”

Attorney Eric Dubelier, for Concord Management, the Russian firm connected to the case did not respond to a request for comment for the story.