Investigators have been sent to Jingzhou Shuanggang Poultry Breeding and Processing Co. Ltd. and Jingshan Pengchang Agricultural Product Co. to track down the source of the contamination, the Beijing Times said.

Eggs from the two companies, both based in central China's Hubei province, were pulled off shelves in Hong Kong after they were found in late October to have melamine that exceeded local limits.

The cases emerged after fresh eggs from another producer, the Haiwei Group in Liaoning province in the northeast, tested positive for the chemical.

Four children have died and 53,000 fallen ill in China after drinking milk or milk products laced with melamine, which can make the protein content appear higher than it actually is.

The Beijing Times said investigators tested eggs and feed in a county that supplied the Jingshan Pengchang company, but so far all samples had been up to standard.

They tainted eggs exported by the other company were actually procured in Liaoning, and investigaors have asked authorities there to help trace their source, the report said.

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