Authorities in northeast China say fresh eggs found to contain the industrial chemical melamine in Hong Kong might have been subject to feed contamination at mainland poultry farms. DalianCity government on Wednesday issued a statement saying that eggs found with the chemical by the Center for Food Safety in Hong Kong over the weekend were produced on 6 September by Hanovo Foods Co. Ltd. in the city. The tainted eggs, which had a best-by date of 25 October, came from a Hanovo-owned farm that produced exclusively for the Hong Kong market.