The Food Standards Agency have said:
"The FSA has been made aware of the survey results in which equine DNA was identified in some beef burgers and is working with the Food Safety Authority in the Republic of Ireland to investigate the issue.
"However, at this stage it is not believed to be a food safety risk.
We are aware that investigations are ongoing to ascertain how or why horse meat was used in the products."
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Monday morning weather forecast
Emma Jesson brings you Sunday evening's forecast for Yorkshire and Lincolnshire
Wet and windy spells, interspersed with drier interludes this week. Wintry showers and variable temperatures. Gales and a weather warning