Federal prosecutors are mulling bringing charges against as many as 200 more people for their roles in the Jan. 6, 2021, Capitol attack, including some 60 individuals suspected of assaulting or impeding law enforcement.

The new figures, announced Monday, mark the first time the Justice Department (DOJ) has revealed how many cases it believes are still pending in a probe Attorney General Merrick Garland has hailed as one of the “largest, most complex, and most resource-intensive investigations” in the Department of Justice’s history.

The agency announced the new figures on the fourth anniversary of the riot, where a mob of then-President Trump’s supporters descended on the building as Congress certified the election win of his Democratic opponent, President Biden. Trump has vowed to issue pardons to some rioters, whom he has described as “political prisoners,” within hours of his return to the White House later this month.

Some 1,583 people accused of participating in the riot have faced charges, with more than half of them pleading guilty before trial and hundreds more being convicted by a jury or judge.