Authorities subsequently detected elevated levels of the radioisotope Cesium-137 (Cs-137) in containers in Los Angeles, Miami, Houston, and Savannah.

The FDA is warning that customers should avoid eating certain frozen shrimp sold at Walmart over concerns that it was possibly exposed to radioactive material.

The amount of Cesium-137 detected within the contaminated shipment would not pose an acute hazard to consumers. However, long-term consumption would pose an elevated risk of cancer.