Animal oil for cooking should meet higher quality standards than those for industrial production, and people can tell the difference between the two from their color and smell, Wang said.

Liu Yunfeng, the head of the division of food production supervision of Yunnan provincial bureau of quality and technical supervision, said food safety authorities had investigated thousands of local markets and restaurants, and had asked the oil company to recall more than 136 tons of inferior oil by Monday.

"We have suspended all oil production and set up more than 20 offices across the province to recall suspect oil," said Zhang from Fengrui.

Official food quality inspectors will be deployed to supervise the entire recall process, according to a statement released during the news conference. The food safety watchdog in Yunnan province also planned to investigate all cooking oil in the province, the statement said.

To encourage public supervision of food safety, the provincial office of the food safety committee will speed up enacting regulations to provide rewards for whistleblowers, it said.

Questions:

1. Where was the latest suspect oil found?

2. What is wrong with the oil?

3. Who is under investigation?

Answers:

1. Southwestern China's Yunnan province.

2. A local oil manufacturer is believed to be adding industrial animal fat to edible oil products.

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