German authorities ordered hundreds of pigs slaughtered after tests at one farm showed the animals had elevated levels of dioxin in their systems. 

This is the first instance of evidence that the contamination has spread beyond poultry and eggs, according to authorities, who had already halted pork sales as a precaution when the contamination was first discovered. "We were specifically investigating this farm because they had bought their livestock feed from Harles & Jentzsch, the company that delivered tainted feed to all the other farms that had to be banned," said Lower Saxony's Agriculture Minister Gert Hahne.

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The investigation into both Harles & Jentzsch and potentially infected farms continues, with 558 of the original 4,700 targeted farms remaining closed.