CHICAGO (AP) — Authorities arrested 21 protesters Friday and said four officers were injured outside a Chicago-area federal immigration facility that activists say functions as a de facto detention center and is plagued by inhumane conditions.

The Cook County Sheriff’s Office said most faced charges of obstruction, disorderly conduct, and walking on a highway. One also faced a charge of mob action. Their ages ranged from 23 to 67.

The office said the four officers were injured while trying to redirect protesters off a roadway and back behind a barrier. Two Broadview police officers and one Cook County Sheriff’s Police officer were taken to a hospital. The Sheriff’s Police officer sustained a lower leg injury and was treated and released. The Broadview Police Department said its officer

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