The Food and Drug Administration is cautioning consumers against eating select packages of Great Value raw frozen shrimp sold at Walmart, citing potential contamination with Cesium-137, a radioactive isotope.

The Food and Drug Administration ( FDA) warned Americans that some shrimp products sold at Walmart may contain a radioactive substance known as Cesium-137.

The FDA detected Cesium-137, a radioactive isotope, in one shipment of Great Value frozen raw shrimp to Walmart. It said the affected shipment wasn’t sold.