Federal investigators raided the headquarters of the Sergeants Benevolent Association, as well as a Long Island home that appears to belong to the union's president, Ed Mullins, officials confirmed.
The FBI descended on the Lower Manhattan office of the NYPD union as part of an "ongoing investigation," according to an agency spokesperson.
A private home in Port Washington, Nassau County was also searched as part of the probe. The location of the raid, provided by the FBI, matches a listed address for Mullins, the controversial head of the 13,000-person sergeants union.
The nature of the investigation remains unclear. Sources told NY1 that federal prosecutors are looking into a "possible mismanagement of funds," while the New York Post reports that the probe involved suspicious of mail and wired fraud.
The headquarters of the SBA on 35 Worth Street
Mullins is currently facing an internal NYPD misconduct investigation for making bigoted and profane statements on Twitter and for posting the arrest record of Mayor Bill de Blasio's daughter last year. He has also faced criticism for circulating an explicitly racist video to the union's members.
Last year, the SBA called on President Trump — whose campaign the union endorsed — to "send in the Feds," warning that progressive politicians had put New York City "under siege."
De Blasio received a note alerting him to the raid during a press conference on Tuesday morning. “A lot of what he’s done has been really, really destructive — especially in the middle of a crisis where we’re trying to unify and we’re trying to get through together," the mayor said. "I think he’s been a divisive voice."
Inquiries to the SBA were not returned. Mullins' cell phone went straight to voicemail on Tuesday morning.
This story has been updated.