The chair of the Environment, Food and Rural Affairs Select Committee has called for a temporary ban on imports of meat from the EU.
Speaking on BBC Breakfast, Conservative MP Anne McIntosh said: "I believe there should be a moratorium on the movement of all meat until such time as we can trace the source of contamination."
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.