Tests on four beef products sold by Birds Eye, Taco Bell and catering supplier Brakes have been found to contain horsemeat.
Checks revealed contamination of Birds Eye Traditional Spaghetti Bolognese and Beef Lasagne, Taco Bell's ground beef and Brakes' spicy minced beef skewer, the Food Standards Agency said.
Ten tests on the four products returned results of more than 1% horsemeat, the FSA said, and all four have been withdrawn from sale.
Meanwhile, McDonald's said tests for horsemeat in its products had come back negative.
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