Special counsel Robert Mueller’s team has again delayed former White House national security adviser Michael Flynn’s sentencing hearing, a signal that Flynn is still cooperating with the ongoing Russia probe.

According to a court filing from Tuesday, the special counsel’s office claims that “due to the status” of the probe, it does not “believe that this matter is ready to be scheduled for a sentencing hearing at this time.” The next update is slated for no later than Sept. 17.