Greenpeace has discovered genetically modified rice in Guangzhou, raising fears that the illegal crop is spreading further into the food chain in China's major cities. Researchers from the environmental group collected 20 samples of Hubei-produced rice from wholesalers in Guangzhou in April. Tests by an independent laboratory in Germany found two contained GM rice. Tests in February on an earlier batch collected in Hubei also found GM rice. A Guangzhou wholesaler who dealt in some of the GM rice said he sold 60 tonnes a day, mainly to factories and restaurants in Guangzhou, Zhongshan, Shunde and Zhuhai. GM rice is illegal on the mainland and is not approved as safe to grow or eat. With Hong Kong sourcing some of its rice from Guangdong, Greenpeace warned that untested GM rice could cross the border. The Food and Environmental Hygiene Department said no GM rice had entered Hong Kong, but controls would be tightened.