The U.S. Food and Drug Administration on Tuesday issued a warning about a frozen shrimp brand sold at some Walmart stores in the U.S. due to radioactive contamination.

Walmart has recalled frozen, raw shrimp sold in 13 U.S. states because federal health officials say it could have potential radioactive contamination.

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