A toxic food scandal in China is spreading fast, dragging in U.S. coffee chain Starbucks, Burger King Worldwide Inc. and others, as well as products of McDonald's Corp. as far away as Japan.

McDonald's and KFC's parent Yum Brands Inc. apologized to Chinese customers Monday after it emerged that Shanghai Husi Food Co. Ltd., a unit of U.S.-based OSI Group LLC, had supplied expired meat to the two chains.

In Tokyo, McDonald's Holdings Japan said Tuesday it gets 20 percent of the chicken it uses for Chicken McNuggets from Shanghai Husi but stopped selling nuggets made with meat purchased from the Chinese firm on Monday.