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Four beef products sold by Bird's Eye, Taco Bell and catering supplier Brakes have been found to contain horse DNA, the Food Standards Agency says.
This is the third wave of test results received by the FSA, which has now received a total of 5,430 test results.
Meanwhile, new tests conducted on beef retail products revealed no new cases of horsemeat adulteration, the British Retail Consortium (BRC) has said.
This latest round of tests saw 1,797 products being examined.
The FSA has asked retailers to test beef products for the presence of more than 1% of horsemeat, with anything above that figure considered to be a sign of adulteration.
Its latest results have found that more than 99% of tests show no horse DNA at or above the level of 1%.
The affected products are Birds Eye's Traditional Spaghetti Bolognese and Beef Lasagne - which the company took of shelves last week as a precaution; Brakes' Spicy Beef Skewer; Taco Bell's Ground Beef.