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Police officers turned their backs on New York City Mayor Bill de Blasio as he walked into his press conference about the two NYPD officers shot and killed ambush-style in Brooklyn.

New York police officers Rafael Ramos and Wenjian Liu were were shot and killed in an assassination-like shooting Saturday afternoon. The shooter, 28-year-old Ismaaiyl Brinsley, then shot and killed himself.

#NYPDLivesMatter” was a No. 1 trending Twitter topic in New York Sunday, an obvious reference to previous hashtags of “#BlackLivesMatter” surrounding events in Ferguson, New York and Cleveland following shootings of unarmed black men by police.

#TurnYourBack” also got some Twitter momentum, in reference to the officers, perhaps most notably by actor James Woods, who ranted on the social media network, calling out Al Sharpton and Mayor de Blasio.

Sharpton, who had been in the public eye during  protests and movements surrounding killings of unarmed black men, denounced the officer killings at a Sunday press conference.