Federal regulators have detected possible radioactive contamination in a second food product sent to the U.S. from Indonesia, even as recalls of potentially tainted shrimp continue to grow. The discovery adds to questions about the source of the unusual problem.

U.S. Food and Drug Administration officials last week blocked import of all spices from PT Natural Java Spice of Indonesia after federal inspectors detected cesium 137 in a shipment of cloves sent to California.

The FDA is warning the public about Great Value raw frozen shrimp sold at Walmart due to possible contamination with Cesium-137.

That follows the import alert imposed in August on the company PT Bahari Makmuri Sejati, or BMS foods, which sends millions of pounds of shrimp to the U.S. each year.

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