Herbicide 2,4-D 'possibly' causes cancer, World Health Organisation study finds

Lack of definitive evidence on widely used chemical sways scientists away from 'probable' rating recently given to glyphosate, the main ingredient in Roundup

The widely used farm chemical known as 2,4-D - a key ingredient in a new herbicide developed by the Dow company - "possibly" causes cancer in humans, a World Health Organisation research unit has said.

The classification of the weed killer, 2,4-dichlorophenoxyacetic acid, was made by the WHO's International Agency for Research on Cancer (IARC).