(CHICAGO) Protesters marched peacefully through Chicago Loop in another day of demonstrations over police methods sparked by the fatal shooting to two black men by white officers in Minnesota and Louisiana.

Monday’s demonstration was organized over social media by teenage girls who said they were determined to keep it peaceful.

Demonstrators met in a park along the Lake Michigan shore. Organizers said many protesters put tape over their mouths to symbolize the way police brutality silences African Americans.

The group then marched to a downtown plaza where they joined several hundred more protesters for a rally. The combined group, escorted by police, some on bicycle, then marched through the business district, disrupting traffic.

The demonstrations in Chicago in recent days have been relatively peaceful, though police scuffled with some protesters Saturday, resulting in 16 arrests.

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