Breakfast cereals still contaminated by weed killer, environmental group says

Boxes of General Mills Cheerios cereal sit on display in a market in Pittsburgh, Wednesday, Aug. 8, 2018. (AP Photo/Gene J. Puskar)

(CNN) -- Several popular breakfast foods are testing positive for trace amounts of a controversial weed killer that can increase the risk of cancer.

According to a report released Wednesday by an environmental advocacy group, products including Cheerios and Natural Valley are included in the report.

The Environmental Working Group found that all 21 of the products it tested had levels of glyphosate that were higher than what is recommended for a child's health.

Manufacturers maintain the foods are safe and the findings aren't unprecedented.

Glyphosate is the main ingredient in the weed killer Roundup.