The U.N.’s International Agency for Research on Cancer (IARC) said Friday that three pesticides, including the popular weedkiller Roundup, were “probably” carcinogenic and two others, which have already been outlawed or restricted, were “possibly” so.

IARC classified the herbicide glyphosate — the active ingredient in Roundup — and the insecticides malathion and diazinon as “probably carcinogenic” on the basis of “limited evidence” of cancer among humans.