Downing Street described the latest incident as "distasteful" but stressed there was no evidence of a health risk and urged consumers to follow the FSA advice.
A Number 10 spokeswoman said the matter appeared to involve "acts of criminality" which were being investigated by the police, including officers from the UK.
She could not say, however, whether any tests had been done on school dinners, hospital and prison meals or other state-provided food.
A leading food scientist says the rule change that sparked the horsemeat beef scandal affected lamb products too, and they should be tested.
Retailers and the Food Standards Agency held an emergency meeting today to decide how to proceed with the horsemeat scandal.
The government has called an emergency meeting with retailers and the Food Standards Agency to discuss the horsemeat scandal.