Walmart has recalled some shrimp products in 13 US states after one shipment of seafood tested positive for radioactive contamination.
The US Food and Drug Administration said varieties of frozen shrimp sold under Walmart's Great Value label could have been exposed to a dangerous isotope in shipping containers.
One sample of breaded shrimp tested positive for the substance, but this positive sample "did not enter US commerce", the FDA said.
Consumers are advised to throw away recently bought Walmart shrimp that matches this description - and not to eat or serve it.
"The health and safety of our customers is always a top priority," a Walmart spokesperson told the BBC. "We have issued a sales restriction and removed this product from our impacted stores. We are working with the supplier to investigate."
