WASHINGTON (AP) — The Food and Drug Administration is urging food distributors, retailers and food service vendors to remove from the market oysters, clams, mussels and scallops imported from South Korea because of possible contamination with human waste and norovirus.

The decision follows an FDA evaluation that determined that the Korean Shellfish Sanitation program no longer meets adequate sanitation controls. The federal agency is in discussions with South Korean authorities to resolve the issue.