The Chinese government has seized 26 tons of contaminated milk powder, the latest episode in an ongoing struggle to combat toxic dairy products.

Authorities reportedly confiscated the milk powder, which was tainted with the industrial chemical melamine, from an ice cream maker based in the southwestern city of Chongqing. Reuters, citing an account from the official Xinhua News Agency, said the ice cream company bought the product from a supplier at a below-market price in March.

The government said that none of the milk seized Tuesday, which first was sold by a producer in Inner Mongolia in 2009, ever made it to the market. Officials at three companies have been detained in the case.

The safety of Chinese milk has been a controversial issue ever since melamine-laced milk killed six toddlers and sickened hundreds of thousands in 2008. The government has cracked down on illegal practices in milk production, most recently by shutting nearly half of the nation’s dairy producers for failing to maintain safety standards, according to the BBC.

Despite the efforts, episodes involving melamine and other contaminants in milk have been fairly regular in China since 2008.

Unscrupulous producers have used melamine to inflate the measures of protein in watered-down milk, which allows dairies to lower costs and undercut legitimate milk vendors.

In a separate case, three Chinese infants died this month after drinking nitrate-laden milk, the victims of what police said was an intentional poisoning by a dairy seeking revenge against a rival producer.

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