CHICAGO - Chaos erupted in Chicago’s Little Village neighborhood late Saturday morning as federal immigration agents detained a person and reportedly used a flash bang as an angry crowd gathered, according to an alderman and video of the incident posted on social media.

What we know:

The incident happened near the intersection of 26th Street and Pulaski when agents appeared to detain one person, according to Ald. Michael Rodriguez (22nd Ward).

Rodriguez said in a video posted on his Facebook page that agents were "causing all sorts of mayhem." He said agents used a flash bang against a gathered crowd.

"They’re doing things that are unconstitutional, that are illegal," Rodriguez said. "They are causing fear and mayhem in our communities and that's unacceptable."

A video posted on I

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