(CBS) — The unrest in suburban St. Louis drew hundreds of people to a rally in Chicago’s Daley Plaza Thursday evening.

At 6:20 p.m., for nearly five minutes, those taking part in the Daley Center rally raised their arms and stood silently in a gesture of surrender — the same gesture witnesses say 18-year-old Michael Brown made before being shot and killed by police in Ferguson, Mo.

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The shooting has touched off days of unrest.

It was the only quiet moment during the 90-minute rally, which was punctuated by frequent chants of “All lives matter” and “Black lives matter.”

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While one speaker said she has taken part in similar rallies too many times, another said now is the time for those who consider themselves to be victims to speak up and be heard.

Several speakers urged protesters to “be mad” but to be ready to seize the chance to be heard.

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Organizers of the Daley Center rally said similar rallies took place in more than 50 other U.S. cities.