The Chinese partner of Hero Group, a major Swiss baby formula manufacturer, has been accused of deliberately mislabelling milk powder and a senior employee has been detained, officials say.
Authorities in Suzhou in eastern China, where the Xile Lier company is based, on Thursday said the firm had committed multiple offences, the person in charge Mou Jun had been arrested, and almost 25 tonnes of formula seized.
The news came after state broadcaster CCTV said the firm had been "adulterating" its product by mixing out-of-date formula with supplies imported under its partnership agreement with Hero.
Baby formula is a particularly sensitive product in China after at least six babies died and another 300,000 became ill in 2008 from drinking milk tainted with the toxic chemical compound melamine.
The company which produced the tainted milk in 2008 was engaged in a joint-venture with a New Zealand firm, underlining the risks for foreign companies entering China's fast growing food market through such schemes.