The EU has demanded that all long grain rice from America must be tested and found to be free of GM before being allowed entry, the European Commission announced Wednesday.

The notice was served following disclosure that small amounts of an unauthorised type of genetically engineered long grain rice had found its way into the feed and food chain in the US. Japan has already blocked all imports of US long grain rice.

The EU imported 198,000 tonnes of long grain rice from the US, worth EUR52m (US$66.7m), last year. The US Department of Agriculture said the rice and the protein it contained "is not a threat to human health or plant life," adding it was reviewing the EU's demands.