Moscow  - At least three people have died from a toxic spillage at a Chinese plant on the border with Russian, the ministry of natural resources cited Chinese media as saying.

"The Chinese side has not yet disclosed what chemical agents leaked," deputy minister Oleg Mitvol said Friday, adding that it was too soon to asses the damage to Russia.

News of the toxic leak raised fears of repeat ecological disaster on the scale of a November 2005 spillage that polluted vast swaths of Russia's Far East.

More than 100 tonnes of chemicals then leaked into the Amur River carrying huge toxic slicks North to Russia, but China delayed informing Russia of the incident for several days. (dpa)