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Ling said distributors arrested for selling tainted milk likely led authorities to the convenience stores where the contaminated product was found. She had no other details and said the investigation was still under way.
Earlier this month, government officials said the Shanghai Panda Dairy Co. had been under a secret investigation for nearly a year before announcing it produced melamine-tainted milk.
China's troubles in cleaning up its food supply chain reflect problems it has had coupling its rapid growth with product safety in other areas.
Earlier this month, an investigation by The Associated Press found 12 of 103 pieces of Chinese-made children's jewelry bought in U.S. stores contained at least 10 percent cadmium, some in the 80 percent to 90 percent range.
Cadmium, like lead, can hinder brain development in young children, according to recent research, and also causes cancer. China has not commented on reports of the cadmium problem.
The U.S. Consumer Product Safety Commission warned parents to "safely dispose" of any cheaply made jewelry or trinkets, most of which are imported from China.
Copyright 2010 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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