Police officers in St. Louis, Mo., reportedly chanted “whose streets, our streets” as protesters took to the streets early Monday to demonstrate against the acquittal of a white former police officer in a black motorist’s shooting death.

Officers wearing riot gear employed the phrase, according to The Associated Press. The phrase is a mantra typically used by protesters in recent years.

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A photojournalist for the St. Louis Post-Dispatch also reported hearing police chanting the phrase after making arrests. He added that a commander he spoke with said police officers using the phrase is not acceptable.

It was chanted twice, AP journalists heard it too, I confirmed w/ 5x civilians standing closer to cops who chanted & with 2x cops at scene https://t.co/syuuAfi2bM — David Carson (@PDPJ) September 18, 2017

Sunday evening marked the third night of violent protests in St. Louis, according to The Washington Post. The demonstrations come after a judge last week acquitted former St. Louis police officer Jason Stockley on murder charges in the shooting death of Anthony Lamar Smith.