U.S. Customs and Border Protection detected Cs-137 in shipping containers at four ports in the United States. The FDA tested a sample of frozen shrimp from Indonesia’s BMS Foods, which came back positive for Cs-137. No shrimp that has tested positive for Cs-137 has entered the U.S. food supply, per the FDA.

This marks the second recall of frozen shrimp this week after both companies' products were potentially exposed to Cesium-137.

The Food and Drug Administration issues a second recall on frozen shrimp after potential exposure to radioactive material.