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

The Food and Drug Administration has classified the recall of just over a thousand bags of Tostitos tortilla chips as a Class I recall.

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.