The Department of Agriculture (USDA) issued a nationwide recall for 20,000 pounds of beef patties shipped to schools, citing “possible foreign matter contamination.”

The recall applies to ready-to-eat beef patties potentially contaminated with “soft purple plastic,” according to Advance Pierre Foods Inc. The patties in question were produced on Nov. 30, 2018.

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The USDA’s Food Safety and Inspection Service (FSIS) said the problem was discovered Monday following two complaints to the company. Although the affected products were distributed to schools, they were sold commercially and not provided by the USDA for the National School Lunch Program, according to the agency.

“FSIS is concerned that some product may be frozen and in food service freezers. Food service locations who have purchased these products are urged not to serve or consume them,” the USDA wrote. “These products should be thrown away or returned to the place of purchase.”

The agency added that there have been no reports of adverse reactions due to consumption of the products thus far, but advises anyone concerned about illness or injury to contact a health care provider.