The Food and Drug Administration is warning the public not to eat, sell or serve certain frozen shrimp that's sold at Walmart stores over concerns it may be radioactive.

So far, no products that tested positive for Cesium-137 (Cs-137) have reached U.S. stores.

What we know:

The FDA is investigating reports of Cesium-137 (Cs-137) contamination in shipping containers and frozen shrimp from PT. Bahari Makmur Sejati (BMS Foods) in Indonesia.

U.S. Customs & Border Protection (CBP) found Cs-137 in containers at four U.S. ports: Los Angeles, Houston, Savannah, and Miami.

The FDA tested several samples and confirmed Cs-137 in one batch of breaded shrimp. However, any containers or products that tested positive have been blocked from entering the country.

The FDA is working with CBP to keep

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