NEW YORK (CBSNewYork/AP) – The anti-Bill de Blasio campaign that began days after NYPD officers Wenjian Liu and Rafael Ramos were gunned down in Brooklyn continued Tuesday.

Photos posted on social media showed a plane trailing a banner calling for de Blasio’s resignation.

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The message reads “De Blasio Get Off The Pot Resign We ♥ NYPD.”

Previously, banners reading “De Blasio Our Backs Have Turned To You” have been spotted flying along the Hudson river.

Police unions blame de Blasio for fostering an anti-NYPD sentiment they claim contributed to the shooting deaths.

The mayor has denied criticizing police and aides say he will not apologize for remarks the unions have deemed anti-police.

Some NYPD supporters also gathered in Queens Tuesday to make their feelings known at a pro-police rally. About 100 people gathered Tuesday afternoon at Queens Borough Hall.

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The event was led by retired NYPD Capt. Joseph Concannon, who said he wanted to demonstrate the kind of support law enforcement has in the city, despite recent anti-police brutality protests.

Concannon said other rallies are planned in other boroughs.

On Tuesday, de Blasio said he did not become depressed, despite feeling very sad, after the killings.

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