Two prosecutors detailed to the Russia investigation for the past year are returning to their duties in other parts of the Justice Department. They join two other attorneys who left the team over the summer.

The departures, confirmed by Mueller’s office Tuesday, are the latest indication that the special counsel is wrapping up at least some pieces of an investigation that has shadowed Trump’s presidency from the outset. But it’s only a limited view into the tight-lipped Mueller’s timetable or possible endgame. Critical investigative strands still remain, such as an active grand jury probe of longtime Trump associate Roger Stone and ongoing negotiations over an interview with Trump.

Mueller spokesman Peter Carr said prosecutor Brandon Van Grack has already returned to the Justice Department’s national security division but will continue to be involved in cases he was assigned to. That includes the investigation into former White House national security adviser Michael Flynn, who is scheduled to be sentenced in December.