More than 140 workers were arrested at the second largest raid in Ohio in the past two weeks. The 146 arrests in one of the largest immigration raids in recent years happened at Fresh Mark’s meat processing plant in Salem, in northeastern Ohio. Immigration agents and local authorities also carried out search warrants at the company’s two other locations in Massillon and its plant in Canton.

The investigation focused on whether the company knowingly hired people who are in the country illegally and used fake identities belonging to U.S. citizens to get their jobs, Immigration and Customs Enforcement officials said. Still, no criminal charges have been filed against Fresh Mark.