CHICAGO (AP) — Authorities arrested 21 protesters Friday 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 reported that the arrests occurred by midday as officials were verifying identities and potential charges.

The clash erupted shortly after 10 a.m. when a large group of demonstrators, aware of imminent arrests, crossed the protest barrier and approached the U.S. Immigration and Customs Enforcement facility. The protesters, numbering around 300, carried signs with messages such as, “God’s Love Knows No Borders” and “God Demands Freedom,” while some engaged in prayer.

Law enforcement included officers from the Illinois State Police and Cook County sheriffs’ police. The facility in Broadview has been a frequent protest site, especially on Fridays, against the federal immigration enforcement operation known as “Operation Midway Blitz,” which has led to over 3,200 arrests in the Chicago metropolitan area since September, targeting individuals suspected of violating immigration laws.

The aggressive tactics employed by Customs and Border Protection and U.S. Immigration and Customs Enforcement have faced significant criticism, sparking both legal challenges and public outcry through various protests.