CHICAGO (WLS) -- Chicago leaders are demanding an investigation after agents detained several people outside a South Loop immigration center Wednesday.

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Alderman Anthony Quezada, of the 35th Ward, was outside the U.S. Immigration and Customs Enforcement Intensive Supervision Appearance Program Office in the South Loop on Wednesday.

"We decided to engage in nonviolence, civil disobedience and practice our first amendment right," Quezada said. "We were standing on the sidewalk, and we were preventing the ICE vans from entering into the facility."

At one point, video shows as protesters and leaders clashed with federal agents in the 2200-block of South Michigan Avenue.

An immigration attorney told ABC7 the people arrested there got

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