The meat in beef lasagne products distributed nationally by Findus have tested positive for more than 60% horse meat, the Food Standards Agency (FSA) has confirmed.
Findus has already begun recalling the products, which were distributed to the UK's main supermarkets and smaller convenience stores, following concerns raised by its French supplier Comigel.
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.