U.S. Immigration and Customs Enforcement (ICE) agents arrested 146 employees at a meatpacking plant in northeast Ohio on Tuesday, according to multiple reports.

ICE officials told The Associated Press they are investigating whether the Fresh Mark meat processing plant in Salem, Ohio knowingly hired undocumented immigrants. No criminal charges have yet been filed against the company.

The agency is also probing whether undocumented immigrants employed by the company possessed fraudulent identification belonging to U.S. citizens.

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A spokesman for the agency said the majority of people detained were Guatemalan.

According to the AP, Fresh Mark is a member of ICE's self-policing program, which allows employers to verify whether its staffers are undocumented or using fraudulent identification.

"Unlawful employment is one of the key magnets drawing illegal aliens across our borders," Steve Francis, the head of the U.S. Immigration and Customs Enforcement's Homeland Security Investigations unit in Detroit, told the news service.

ICE agents arrested 114 employees at a gardening and landscaping company in northern Ohio earlier this month.