Kraft Foods announced Thursday it is recalling white chocolate distributed in the United States because of possible salmonella contamination.

Kraft said consumers who purchased its six ounce, Baker's Premium White Chocolate Baking Squares should immediately discard the product. The recalled product was distributed nationally, and have the UPC Code 0043000252200 and for best when used by March 31, April 1, April 2 and April 3, 2008.

The U.S. Food and Drug Administration detected the presence of salmonella in some packages of the white chocolate baking squares during tests, according to Kraft.

Kraft said in a statement that it was aggressively investigating the source of the problem.

The recall is only for Baker's Premium White Chocolate Baking Squares. No other varieties of Baker's White Chocolate or any other Baker's products sold in the United States are affected by the recall, according to Kraft.

It said consumers can request reimbursement or ask other questions about the recall by calling Kraft at 1-800-310-3704.

Northfield-based Kraft, which markets a variety of products, including Oscar Mayer meats; Post cereals and Nabisco cookies and crackers, is the nation's largest food and beverage companies.