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

For the second time this week, frozen shrimp has been pulled off shelves because of potential contamination by a radioactive isotope. Southwind Foods of Carson, California voluntarily recalled some of its supply of frozen shrimp Thursday over concerns it contained Cesium-137 (Cs-137).

A growing seafood scare has widened as federal officials announced a second shrimp recall tied to possible radioactive contamination, this time involving multiple brands across nine states. The Food and Drug Administration (FDA) said Southwind Foods,