Democratic New York City mayor Bill de Blasio launched a disgusting attack on the New York Police Department officers that symbolically turned their backs on him before a press conference to address the shooting deaths of officers Rafael Ramos and Wenjian Liu.

Ramos and Liu were gunned down in cold blood, execution-style, by Ismaaiyl Brinsley, 28, as retribution for the recent deaths of Michael Brown and Eric Garner. de Blasio infamously encouraged protests against his own police department in the aftermath of the grand jury’s decision not to indict the officers in the Garner case.

“Mayor de Blasio, the blood of these two officers is clearly on your hands,” said Sergeants Benevolent Association police union president Edward Mullins.

“That blood on their hands starts on the steps of City Hall in the office of the mayor,” said Pat Lynch, president of the Patrolmen’s Benevolent Association.

Police union members turned their backs on de Blasio when he entered a press conference after the shooting.

How did de Blasio’s office respond? By attacking the officers.

“It’s unfortunate that in a time of great tragedy, some would resort to irresponsible, overheated rhetoric that angers and divides people,” de Blasio spokesman Marti Adams said in a statement following the union leaders’ remarks.

Journalistic objectivity be damned here for a minute: Shame on you, Mr. de Blasio. Shame on you.

Follow Patrick on Twitter