The agency noted it has recommended that Walmart recall the product.

The U.S. Food and Drug Administration (FDA) issued a warning that Great Value brand shrimp sold at Walmart in 12 U.S. states contained unsafe levels of the radioactive isotope cesium-137.

The FDA said that a radioactive isotope, cesium-137, was detected in a sample of breaded shrimp detained at US ports – in Los Angeles, Houston, Savannah, and Miami – from an Indonesian supplier named...