Vietnam's war against Agent Orange
By Tom Fawthrop
Cu Chi district, Vietnam
Source: BBC News
The Vietnam War ended in 1975, but the scourge of dioxin contamination from a herbicide known as Agent Orange did not.
"The damage inflicted by Agent Orange is much worse than anybody thought at the end of the war," said Professor Nguyen Trong Nhan, the vice-president of the Vietnam Victims of Agent Orange Association (VAVA).
Between 1962 and 1970, millions of gallons of Agent Orange were sprayed across parts of Vietnam.
Professor Nhan, the former president of the Vietnamese Red Cross, denounced the action as "a massive violation of human rights of the civilian population, and a weapon of mass destruction".
But since the end of the Vietnam War, Washington has denied any moral or legal responsibility for the toxic legacy said to have been caused by Agent Orange in Vietnam.
The unresolved legacy and US denials of responsibility triggered three Vietnamese to take unprecedented legal action in January 2004.