At this point, neither Greco nor Shao have been accused of wrongdoing, according to the report. Further, Adams is not linked to the investigation.
The Justice Department last month asked a court to dismiss the corruption charges brought against Adams by the Biden administration. A District Court judge canceled a hearing scheduled for last week, indicating a ruling could be imminent.
The New York Post reported in October that Greco had "disappeared" from NYC and might be cooperating with authorities in the investigation of Adams and other members of his cabinet.