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.

Frito-Lay issued a recall of some bags of Tostito's tortilla chips, saying the snack foods may have been contaminated with undeclared products.The recall applies to 13-ounce bags of the company's Tostitos Cantina Traditional Yellow Corn Tortilla Chips.