New York City Mayor Bill de Blasio is at the center of two separate state and federal grand jury investigations into whether he or his aides broke campaign finance laws or rewarded donors for their contributions, according to a story in The New York Times.

The 1,100-word report posted on the newspaper’s website Thursday night cites confidential sources who, according to the Times, were not authorized to speak because grand jury proceedings are held in secret.

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The sources said it remained unclear whether any criminal charges would be filed against de Blasio, a Democrat, but some of mayor’s aides may also be targets of the probes.

The newspaper said the state investigation is focused on whether de Blasio or his aides illegally diverted money to Democratic committees upstate in an unsuccessful bid during the 2014 election cycle to install a Democratic majority in the State Senate — the chamber that has long been a Republican stronghold.

That probe also is looking into the possible roles of de Blasio aides Emma Wolfe, Ross A. Offinger and Josh Gold, the paper said, again citing anonymous sources.

The federal probe, the story continued, centers around whether de Blasio or his 2013 campaign operatives returned favors to donors to his campaign or his political nonprofit organization — including Long Island businessman Harendra Singh — whose alleged dealings in the Town of Oyster Bay led to October indictments for town Supervisor John Venditto, Nassau County Executive Edward Mangano and his wife, Linda Mangano.

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The office of Preet Bharara, the U.S. attorney for the Southern District of New York, and the FBI are conducting the investigation, while the state inquiry is being handled by Manhattan District Attorney Cyrus Vance Jr., the newspaper said.