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16 January 2013, 06:00
Investigations at a North Yorkshire food plant have started after beef burgers at major supermarkets contained some horse meat.
Food safety officials, who carried out tests two months ago, said the products were on sale at a number of Tesco and Iceland stores in the UK.
They are not a risk to humans, but they have been removed.
Tesco said it was "working... to ensure it does not happen again".
The Food Safety Authority of Ireland, who did the testing, said the meat had come from two processing plants in Ireland and the Dalepak Hambleton plant in North Yorkshire.
The burgers had been on sale in Tesco, Iceland, Dunnes Stores, Lidl, Aldi and possibly Asda.
A total of 27 burger products were tested tested, 10 of them contained traces of horse DNA and 23 containing pig DNA.
Meanwhile, Silvercrest Foods and Dalepak both say they had never bought or traded in horsemeat and that they have launched an investigation into two European third-party suppliers.
A spokesman for Dalepak said: "Analysis is taking place right now but we won't have more information until that analysis is complete."