High levels of arsenic and other chemicals already have killed at least 10,000 fish in the Chongan, a 43-mile river in Guizhou province, the Hong Kong-based Information Center for Human Rights and Democracy said in a statement.
No human injuries have been reported, it said. Provincial and local environmental agencies have gone to the area, the group said.
Calls to the local government office and the provincial environmental office rang unanswered Monday.
It is the latest reported river poisoning incident to hit the country. China's waterways are dangerously polluted after decades of rapid economic growth and lax enforcement of pollution controls.
Late last month, a lead-zinc spill in a river in Hunan province in central China forced a one-day cut in water supplies to more than 200,000 people.
In 2005, an accident caused a chemical plant to spew tons of toxic nitrobenzene and other chemicals into north China's Songhua River, forcing authorities to temporarily halt supplies of running water to millions of people.
Last Mod: 13 Ağustos 2007, 08:59