Four officers have been transferred, and two of those placed on modified duty, as the FBI investigates suspected corruption within the NYPD.

Police Commissioner William Bratton said in a statement that, after a meeting with the FBI’s Assistant Director Diego Rodriguez, the department has transferred and modified Deputy Chief Michael Harrington and Deputy Inspector James Grant. The decision came as a result of an ongoing joint investigation between the NYPD, FBI and Department of Justice.

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Deputy chiefs David Colon and Eric Rodriguez were also transferred as a result of the investigation, according to the statement from Bratton’s office.

“This is not a particularly good day for the department,” Commissioner Bratton said at a news conference, according to the New York Post, which also quoted an NYPD source as saying, “I’m disappointed. It’s a distraction and it takes away from all the good work that we’ve done.”

Deputy Inspector Grant allegedly accepted diamonds and cash from Jeremy Reichberg, a businessman involved in a federal probe into whether NYPD officers took gifts in exchange for favors, the Post added.

That probe has also uncovered allegations that police department officials received Super Bowl tickets and vacations, Newsday reported in a related article. 

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The statement from Commissioner Bratton indicated that potential violations being investigated include infractions against NYPD policies, New York City conflict-of-interest rules and federal criminal laws.