Several of New York City Mayor Bill de Blasio’s longtime associates have been subpoenaed in a widening state and federal probe scrutinizing his fundraising operations, a source said Wednesday.

Those receiving subpoenas include de Blasio fundraiser Ross Offinger, director of intergovernmental affairs Emma Wolfe, and Manhattan-based consulting firm BerlinRosen, which advised the mayor’s winning 2013 campaign and represents clients who seek to influence the city, a law enforcement source confirmed Wednesday night.

The issuing of subpoenas to the associates was first reported earlier Wednesday by The Wall Street Journal.

“City Hall has been subpoenaed by the New York County District Attorney’s Office and the U.S. attorney’s office for the Southern District, and we are fully cooperating with the investigation. The mayor has not been personally served,” de Blasio City Hall counsel Maya Wiley said in a statement.

De Blasio spokesman Peter Kadushin would not say whose name or names were on the City Hall subpoena or subpoenas.

BerlinRosen spokesman Andrew Friedman would not say whether the firm or its co-founder Jonathan Rosen had also been subpoenaed.

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“We’re proud of the work we do for our clients,” Friedman said in a statement attributed to Rosen. “We have acted appropriately and in accordance with the law at all times.”

De Blasio chief spokeswoman Karen Hinton said, “All involved followed the letter of the law and are cooperating fully with the investigations.”

Neither de Blasio nor his aides have been accused of criminal wrongdoing in the probe.

Hours before his office disclosed the subpoena news Wednesday evening, the mayor exited through a side door after an event in Harlem, where his NYPD bodyguards had blocked reporters from approaching. De Blasio hasn’t been accused of criminal wrongdoing in the probe.

A prosecutor listed on the subpoenas is Tatiana Martins, an assistant U.S. attorney who helped convict former state Senate leader Dean Skelos of Rockville Centre, The Journal reported.

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Risa Sugarman, a chief enforcement counsel for the state Board of Election who was appointed by Gov. Andrew M. Cuomo, has accused de Blasio and his aides of funneling large contributions from unions and other donors through county Democratic committees to three Democratic State Senate candidates upstate in 2014 in an unsuccessful effort for the party to retake control from Republicans.

There are few if any restrictions on what a party committee can transfer to a candidate, but the law prohibits contributions to committees from being restricted to particular candidates.