FRESNO (AP) — California regulators are taking a pivotal step toward requiring the popular weed killer Roundup to come with a warning label.

The state’s Office of Environmental Health Hazard Assessment announced Monday that the weed killer’s main ingredient, glyphosate, will be listed in July as a chemical known to cause cancer.

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State spokesman Sam Delson says products like Roundup will have to be labelled as potentially cancerous.

California would be the first state to require the warning labels on Roundup.

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Attorney Michael Baum represents hundreds of people whose loved ones say they’ve died from exposure to Roundup.

Baum says the fight is not over; regulators still must decide how much of the chemical poses a risk.

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A representative for Monsanto, which sells Roundup, was not immediately available late Monday for comment.

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