MINNEAPOLIS (WCCO) — Officials say U.S. Immigration and Customs Enforcement pulled off one of the largest raids of illegal immigrants involving three states Wednesday — including Minnesota.

ICE agents arrested 17 business owners and managers as well as 133 workers. The farms, restaurants, and other agriculture companies involved are in Minnesota, Nebraska and Nevada.

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Homeland Security told WCCO-TV that Christensen Farms — specifically their Appleton and Sleepy Eye locations — knowingly hired illegal immigrants and mistreated them. The arrests were part of a 15-month investigation. Many of the workers were using fake ID’s belonging to U.S citizens.

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ICE officials did not clarifiy the number of people in Minnesota arrested and formally charged.

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Christensen Farms’s Luverne location was the subject of an animal cruelty investigation in 2015.