A limited number of 13-ounce bags of Tostitos yellow corn tortilla chips were recalled by Frito-Lay in late March for undeclared milk.

The Food and Drug Administration this week upgraded the recall of Frito-Lay's Tostitos Cantina-style corn chips to the agency's most severe classification.

Some Tostitos Cantina Traditional Yellow Corn Tortilla Chips may contain undeclared milk allergens, Frito-Lay said.