China has suspended imports from several major U.S. meat processors, including the world's largest, the latest indication the government may be retaliating as its products are turned back from overseas because of safety concerns, according to AP. Frozen poultry products from Tyson Foods Inc., the world's largest meat processor, were found to be contaminated with salmonella, the General Administration of Quality Supervision, Inspection and Quarantine said on its Web site Friday. Other imports barred by China included frozen chicken feet from Sanderson Farms, Inc. found to tainted with residue of an anti-parasite drug, as well as frozen pork ribs from Cargill Meat Solutions Corp. containing a leanness-enhancing feed additive, the agency said. A spokesman for Cargill denied the agency's claims, while officials at Tyson and Sanderson Farms were not immediately available to comment. China's food and drug-safety record has come under scrutiny in recent months following the deaths of cats and dogs in the United States and Canada blamed on tainted Chinese pet food ingredients. Worries at home and around the world have heightened as a growing number of Chinese products are found tainted with dangerous levels of toxins and chemicals.