Yo quiero ground beef tainted with horse meat at Taco Bell!

Europe's growing horse meat problem escalated Friday as Britain's food regulator said that new testing had found the Bell's beef supply tainted with it.

Taco Bell parent company Yum Brands said the horsemeat issue is limited to the UK market, and that it will step up testing of its beef going forward.

Europe's horsemeat scandal erupted in January, when testing in Ireland revealed that some ground beef products sold there contained equine DNA.

Burger King horsemeat samples were also found in February.