The mystery of how herbal supplements found their way into a frozen fish dinner has now become a case for the U. S. Federal Bureau of Investigation, the Associated Press reports.

News of the surprising content of a 6 Crispy Battered Fish Fillets from Gorton’s Inc. that a Pennsylvania family was preparing to eat has reached the Federal Bureau of Investigation in Philadelphia, who will now investigate how it is that herbal supplements were found in the product.

Jerri Williams, a spokeswoman for the Federal Bureau of Investigation in Philadelphia, confirmed Monday to the AP that the agency was trying to determine whether a crime occurred.

“That's part of the investigation, to look at how the pills got into the food product,” she said. “At this time, it's an open investigation.”

Gorton’s has voluntarily recalled 1,000 cases of its Crispy Battered Fish Fillets in eleven states. The Gloucester, Mass.-based company says the pills were tested and found to be “harmless herbal supplements” but the U. S. Food and Drug Administration is not content with such an explanation.

FDA spokesman Brad A. Swezey declined comment on the investigation and called the case “suspected tampering,” per the AP.

The Rowan family of New Freedom, Pennsylvania, called police on Feb. 24. Tracy Rowan reported that she and her 9-year-old daughter discovered the pills in the fish’s mouths as they ate dinner. Rowan, her daughter and her 10-year-old son were examined at a local hospital but were not ill.

Other states where the fish was distributed are Alabama, California, Delaware, Florida, Georgia, Mississippi, Oklahoma, South Carolina, Tennessee and Texas.

The product is 11.4 ounces and bears a UPC Code of No. 4440015770, date code of 7289G1 and best-if-used-by date of April 2009.

Gorton’s official website: www.gortons.com\