Burger King said on Thursday it had stopped using one of the firms involved in supplying British grocers with hamburger that contained horse meat, Reuters reported. The fast food chain announced on its website that they had decided to replace all Silvercrest products in Britain and Ireland with products from another Burger King supplier. "This is a voluntary and precautionary measure," Burger King said. "We are working diligently to identify suppliers that can produce 100 percent pure Irish and British beef products that meet our high quality standards." Burger King's announcement comes on the heels of news that retailers including Tesco, Britain's largest retailer, had sold beef products that contained horse meat. The market leader immediately withdrew all products from its supplier, Silvercrest. Other meat producers whose hamburgers tested positive for horse DNA include Liffey Meats in Ireland and Dalepak Hambleton in Britain. Food safety experts say horse meat poses no added health risks to consumers, but the discovery has raised concerns about the food supply chain and the ability to trace meat ingredients.