Just because special counsel Robert Mueller has ended his probe into Russian interference in the 2016 presidential election, that doesn’t mean the grand jury he assembled is done working just yet.

Politico reports that Assistant U.S. Attorney David Goodhand acknowledged this week that the grand jury will continue to investigate Russian interference even though Mueller’s role in the probe has ended.

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In fact, when asked by U.S. District Court Chief Judge Beryl Howell whether the grand jury was still active, Goodhand replied that it was “continuing robustly.”

The grand jury is still working on tying up several loose ends related to the Russia probe, including one case involving an unnamed foreign company that has been held in contempt for defying a Mueller subpoena.

Before shutting down, Mueller’s office also had been trying to compel the testimony of Andrew Miller, a longtime aide to Trump ally Roger Stone. Stone was indicted earlier this year on counts of perjury, witness tampering and obstruction of justice.

It is unclear at this point what more the grand jury could learn that is not already in Mueller’s final report, although Politico contends that it “adds a new layer of uncertainty” to the investigation, which officially wrapped up last week after being active for 21 months.