The NYPD’s Internal Affairs Department and the FBI executed a series of search warrants early Wednesday at locations tied to current and former NYPD officials as part of a criminal investigation, Police Commissioner Jessica Tisch said.

An investigation is targeting current and former police executives, sources familiar with it told ABC News.

The searches stemmed from an ongoing probe into the conduct of former NYPD Chief of Department Jeffrey Maddrey, a source told CBS News.

The NYPD’s Internal Affairs Department and the FBI executed a series of search warrants early Wednesday at locations tied to current and former NYPD officials as part of a…