It was actually the International Agency for Research on Cancer, which is part of the World Health Organization. Canada is one of 16 member countries that support IARC. I had the pleasure of serving on the scientific council for four years, representing Canada between 1992 and 1996. It's considered the most authoritative body on cancer risk issues in the world. They invited representatives from 14 countries to participate in the study; each country had to raise the funding for the research internally. The only country that didn't manage to participate was the United States. They could not get funding internally.
On February 27th, 2007. See this statement in context.