A German food watchdog has called for Kinder chocolate bars, as well as other foods, to be recalled after tests found they contain dangerous levels of what have been described as "likely carcinogens," The Independent reports.

Foodwatch said that mineral oil aromatic hydrocarbons (MOAHs), which are created when oil is refined, have been found in the products.

The watchdog tested 20 different products and found three with what it said were “dangerous” levels of the oil byproduct.

Foodwatch has since asked that Ferrero’s Kinder Riegel chocolate bar, Lindt’s Fioretto Nougat Minis and one other German product be taken off sale, The Independent says.

In a statement on their website, the watchdog said: “Foodwatch had the the producers concerned informed in advance about the test results and called for a public recall.

“They refused, however, to remove products from sale.

The European Food Safety authority describes MOAHs as "likely carcinogenic and mutagenic."