The outspoken head of the NYPD sergeants union is under internal investigation for tweeting a declaration of “war” against Mayor Bill de Blasio, who last week said “there should be consequences for that kind of speech,” sources told The Post on Friday.

The probe of Sergeants Benevolent Association President Ed Mullins follows his questioning by the Internal Affairs Bureau for publicly asserting that Barnard College freshman Tessa Majors was fatally mugged in Morningside Park last year after going there to buy pot, sources told.

That grilling, in early January, came after de Blasio blasted Mullins’ remarks as “heartless” and “infuriating.”

“We don’t shame victims in this city,” de Blasio tweeted on Dec. 15.

Mullins, a frequent and harsh critic of the mayor, ramped up his rhetoric on Feb. 9 following the wounding of two cops in separate shootings in The Bronx over a 12-hour period.

“Mayor DeBlasio, the members of the NYPD are declaring war on you! We do not respect you, DO NOT visit us in hospitals,” Mullins tweeted.

“You sold the NYPD to the vile creatures, the 1% who hate cops but vote for you. NYPD cops have been assassinated because of you. This isn’t over, Game on!”

The next day, de Blasio responded by telling reporters that “it’s sad when someone feels they can be openly divisive and get away with it.”

“I think there should be consequences for that kind of speech,” Hizzoner added.

The IAB investigation of Mullins, first reported by Gothamist, will cover both his tweet against the mayor and any other inflammatory statements that may have violated NYPD regulations.

“The probe will look at Mullins’ history of rash remarks to determine if they conflict with his commitment to public safety as a sworn officer,” a source said.

The NYPD Patrol Guide details two dozen types of banned “public contact,” including the broad category of “engaging in conduct prejudicial to good order, efficiency, or discipline of the Department,” and the city Administrative Code also gives Police Commissioner Dermot Shea the power to punish cops for “conduct unbecoming an officer.”

Penalties can range from a reprimand to firing, but only after conviction at a departmental trial.

Under the SBA’s constitution, only active NYPD sergeants can be nominated to run for president, but the rules don’t say what happens if the union’s president gets fired mid-term.

In August, The Post exclusively revealed that Mullins sent SBA members an email containing a 15-minute video of a police shooting in Los Angeles with overtly racist narration.

“Pay close attention to every word. You will hear what goes through the mind of real policemen every single day on the job,” Mullins wrote.

Mullins later apologized for sharing the video, saying that he got it from a retired sergeant he described as a “pretty good guy” and that he didn’t listen to the audio before sharing it.

During the IAB questioning of Mullins in January, he was asked where he got his information about why Majors went to Morningside Park on the evening she was killed, a source familiar with the matter said.

Mullins, who was summoned to One Police Plaza with two other members of the SBA executive board, responded that he’d been a cop for 38 years and “guessed it,” the source said.

Asked to comment on the investigation of Mullins, mayoral spokeswoman Freddi Goldstein said, “Ed Mullins is supposed to be a leader in this city. It’s time he act like it. His comments were clearly inappropriate and he should be held accountable.”

Mullins declined to comment.

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