Downing Street today said that they cannot rule out that horse meat has been served to millions of school pupils and hospital patients.
It emerged last night that beef lasagne meals sold by fast food giants Findus were up to 99 per cent horse.
The food giant has now been ordered to test the dishes for a cancer-causing painkiller used by vets.
Today a spokesman for Findus said they received notification on Saturday that their products may contain horsemeat.
The company issued a full product recall on Monday before DNA testing on Wednesday confirmed horsemeat was in their products.
Findus today reiterated its apology over some of its beef lasagne products containing horse meat.
The company said it was “sorry that we have let people down”.
Ministers were rapped over the scandal and customers warned to take meals back to shops.
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.