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The milk contamination crisis in China has worsened, with a reported 13,000 infants now affected by tainted dairy produce.

Four deaths have been blamed on toxic milk powder, which has been contaminated with the industrial chemical melamine.

The contamination has spread to other dairy products, such as ice cream and yogurt, and Reuters recently revealed that a popular milk sweet had also been found to contain melamine.

China's food quality watchdog has said it found melamine in nearly 10% of milk and drinking yogurt samples from three major dairy companies: Mengniu Dairy Co, the Inner Mongolia Yili Industrial Group and the Bright group.

China's "quality chief", Li Changjiang, resigned from his position on Monday. The Xinhua news agency stated that "Li was the highest ranking official brought down so far by the dairy product contamination scandal".