Tyson Fresh Meats Inc. on Friday recalled more than 40,000 pounds of ground beef shipped to Wal-Mart stores in Kansas and 11 other states after samples tested at a Sherman, Texas, plant showed signs of E. coli contamination.

No illnesses had been reported. Other states affected are Alabama, Arkansas, Colorado, Kentucky, Louisiana, Mississippi, Missouri, New Mexico, Oklahoma, Tennessee and Texas.

Wal-Mart has removed the products from its meat cases.

The recalled ground beef had sell-by dates of June 13. The products include 1 1/2-pound trays of Angus steak burger all natural, 85/15, six quarter-pound patties; 1.33-pound trays of Angus steak burger all natural, 85/15, extra thick, 4 1/3-pound patties; 2 1/4-pound trays of 73/27 all-natural ground beef; and 5 1/2-pound trays of 73/27 all-natural ground beef.