The federal judge overseeing special counsel Robert Mueller’s grand jury in Washington, D.C., has extended the grand jury’s service for up to another six months, CNN reported Friday.

The grand jury, which has handed down a number of indictments in Mueller’s investigation, was seated by Judge Beryl Howell, the chief judge of the U.S. district court in D.C., in July 2017 and its 18-month term was set to expire soon.

Six months is a standard length of time for federal grand juries to be extended.