Washington, D.C. ? The U.S. is blocking imports of wheat gluten from a company in China, acting after an investigation implicated the contaminated ingredient in the recent pet-food deaths of cats and dogs.

The Food and Drug Administration took action against wheat gluten from Xuzhou Anying Biologic Technology Development Co. in Wangdien, China, after the U.S. recall of nearly 100 brands of pet food made with the chemically contaminated ingredient. The pet food, tainted with the chemical melamine, apparently has resulted in kidney failure in an unknown number of animals across the country.

Wheat gluten from China has been suspected in the outbreak since the first of multiple recalls was announced in mid-March. Even more pet food could be recalled in the next few days, though there probably has been no contamination of human food, FDA officials said Monday.