The recall was issued on June 6 for 20 million eggs distributed to Walmart, Safeway, chains owned by Kroger and various other independent and chain supermarkets around the country. The Centers for Disease Control is recommending that people throw the eggs away.

Nearly 2 million eggs recalled for Salmonella risk from various Walmart stores, with instructions to return for a refund.

The news came late Friday, as officials say the eggs—which were sold at Walmart and other retailers—are part of an outbreak investigation.