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.”

Federal health authorities have upgraded their recall of 13-ounce bags of Frito-Lay potato chips over fears that consuming the products, which may contain undeclared milk, could potentially be fatal. Last month, the Food and Drug Administration announced that Frito-Lay was voluntarily recalling a limited batch of products.

There's been an update regarding the Lay's recall that affected shoppers in the states of Oregon and Washington. The recall now has an official classification.