Dasha Ramirez, 8, and her little brother were playing with the water at the Crown Fountain in Chicago’s Millennium Park when federal agents approached their parents on a sunny Sunday afternoon.

She ran toward her father, Jaime Ramirez, who was suddenly surrounded by a group of heavily armed agents in full camouflage. A second group encircled her mother, Noemi Chavez, who had been sitting quietly on a nearby bench, helping her 3-year-old son put on his shoes.

“They approached me and asked me if I had my documents,” said Noemi Chavez during a phone call to the Tribune Sunday night following their detention. “I told them I was not going to answer any questions and demanded a warrant.”

Her request, she said, was ignored.

Cradling her son in her arms, Chavez was escorted toward her husband,

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