Here is a list of the attendees at today's horsemeat summit held by Environment secretary Owen Paterson:
Morrison, Co-operative Food, ASDA, Sainsburys, Tesco, British Meat Processors Association, Federation of Wholesale Distributors, British Retail Consortium, Food and Drink Federation and consumer goods experts IGD.
M&S, CFA, Waitrose and Lidl were all invited but did not turn up to the summit.
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.