Source of tainted milk still a secret

BEIJING - Four days after it was announced that a batch of milk produced by China's biggest dairy manufacturer was tainted with excessive levels of a cancer-causing toxin, the company says the culprit was mildewed feed, but it still refuses to reveal the batch number and the source of the raw milk.

"The reason for the incident has been identified as moldy cattle feed, which led to excessive aflatoxin in the raw milk," Mengniu Dairy Group said in a statement on its website in Hong Kong on Wednesday.

No equivalent statement was posted on its mainland website.