Citing Xinhua News Agency, Arirang reports that a broker named Tang bought roughly 7 tons of melamine-tainted formula in Hebei, a northern province of China, and sold 2 tons of it to pig farmers in Chungqing and Chengdu.

The amount of melamine detected in the feed was over 5-hundred times the legal limit.

The farmers say that they stopped using the contaminated formula after their pigs became ill but Chinese consumers are still worried that melamine-contaminated pigs may have entered the country's food supply.

In 2008, several Chinese companies were implicated in a scandal involving milk and infant formula that had been adulterated with melamine from which six babies died and some 300-thousand others were sickened.