This is big. And this is bad news for the city:

A blue wall of silently seething police officers turned their backs on Mayor de BlasioSaturday night — literally.

As the mayor and his entourage snaked through a jammed third-floor corridor at Woodhull Hospital, where two officers had been pronounced dead just hours earlier, scores of grieving cops faced the walls — and away from the leader they believe has failed them.

Earlier, de Blasio approached a cluster of cops at the Brooklyn Hospital and offered, “We’re all in this together.”

“No we’re not,” an officer replied tersely, according to a cop who witnessed the icy scene.

Horrible day for the NYPD. I don’t blame them for this show of disrespect to de Blasio. If trust has broken down so much that the city’s police force sees the Mayor as the enemy, there are going to be some horrible days for all of New York City.

UPDATE: Gang, what I mean by “I don’t blame them” is not “they were right to do this,” but that I understand why they did it, in the emotions of the moment. It was as shocking as they intended it to be, and I hope they do not do it again. Similarly, I understand it when people whose family member has been killed by cops have over-the-top reactions to it, initially. I think we should extend some limited grace to people in those situations.

UPDATE.2: Oh God:

But the scene outside Woodhull Hospital [where the bodies of the two murdered officers were brought] wasn’t entirely supportive. “You’re a bunch of killers,” a passerby told cops standing sentry there, according to one police source. And short distance from the crime scene—where a crowd was backed up by the police tape—a few members of the crowd repeated “f**k the cops” within earshot of a Daily Beast reporter.

One 30-year-old local who gave his first name only as Carlos, didn’t hear the fatal gunfire but saw the hysteria aftewards and walked to the police tape.

“A lot of people were clapping and laughing,” he said.

“Some were saying, ‘They deserved it,’ and another was shouting at the cops, ‘Serves them right because you mistreat people!’” he said.

What do you want to bet word had spread among those cops that people in the neighborhood were clapping and laughing over the murder of their colleagues?