The US Food and Drug Administration on Tuesday urged the public not to eat certain bags of frozen raw shrimp sold at Walmart, citing concerns about unsanitary conditions and radioactive contamination found in shipments from the same supplier.

The FDA advised the recall in an Aug. 19 notice, saying certain raw frozen shrimp products processed by Indonesian company PT. Bahari Makmur Sejati (doing business as BMS Foods) had tested positive for Cesium-137, or Cs-137. Walmart sells the products under its Great Value brand.

Some packages of Great Value frozen shrimp sold at Walmart are at risk for potential for Cesium-137 contamination, the FDA says.