The Food and Drug Administration has issued a Class 1 recall, the highest level of alert, for select bags of Lay’s Classic Potato Chips. The snack was recalled last month after the chips were found to have contained undeclared milk, one of the FDA’s eight major food allergens that pose life-threatening risks. The recall impacted a “limited number” of 13-ounce bags of Lay’s Classic Potato Chips sold in Oregon and Washington state. “Those with an allergy or severe sensitivity to milk run the risk of a serious or life-threatening allergic reaction,” the FDA wrote in the recall notice on Dec. 16. The agency proceeded to escalate the recall to a Class 1 on Monday, indicating that eating the chips could cause “serious adverse health consequences or death.” The contaminated chips can be identified by the manufacturing code “6462307xx” or “6463307xx.” In a statement, a Frito-Lay spokesperson told The Daily Beast: “This is not a new recall or a change to what was previously announced. The recall was executed in December in full cooperation with the FDA when the issue was identified. The recall was limited to two states, and recalled product has been removed from the marketplace.”