Officers raided the circulation offices for several of New York City’s biggest newspapers as part of an investigation into union corruption.

Police officers working with the Manhattandistrict attorney’s office searched circulation offices of The New York Times in Queens, theNew York Post and the Daily News in Manhattan, and El Diario in Brooklyn

The raid represented a new turn in the city’s investigation of the 1,600 member Newspaper and Mail Deliverers Union. Details about the nature of the investigation are scarce. Officials from the union, newspapers and the District Attorney’s office refused to comment on Tuesday’s events. No arrests have been made as of this time.