Federal regulators have upgraded a product recall of Lay's Classic Potato Chips to the highest risk level for a batch that may contain undeclared milk ingredients. Last month, Frito-Lay issued a recall warning that more than 6,

The FDA classified the recall of Lay's Classic Potato Chips in Oregon and Washington state as a Class 1 recall, which means consumption could be fatal for people with a milk allergy.

The Food and Drug Administration is using its most severe notice in a recall of more than 6,000 bags of chips in two states because of “undeclared milk.”