Asda spaghetti bolognese has become the latest product to be withdrawn from sale after it was found to contain horse meat.
The 500g beef bolognese sauce was pulled from the shelves after tests revealed the presence of horse DNA, the supermarket chain said.
Asda has withdrawn products from the shelves
The company apologised to customers and said it was taking a "belt-and-braces approach" by removing a further three beef products made by the same supplier, Greencore, as a precaution.
An Asda spokeswoman said: "As you'd expect we are withdrawing the Beef Bolognese sauce from our shelves.
"We are taking a belt-and-braces approach so, in addition, as a precaution we're also withdrawing three other beef-based products produced by the same supplier.
"We have no positive test results for horse DNA in any of these products, but we feel it is the right thing to withdraw them anyway.
"We're very sorry if this ongoing situation is causing our customers any upset or inconvenience. We, along with the rest of the industry, are working hard to ensure they can have complete confidence in the food they buy."
Sainsbury's and the Co-op confirmed they were also supplied by Greencore.
Sainsbury's said it was carrying out tests for the presence of horse DNA but added that Greencore used a different beef supplier for its products.
A spokeswoman said: "Greencore makes some of our pasta sauces, e.g. By Sainsbury's Bolognese Sauce.
"We are testing those that contain beef, however we know that our beef is from a different supplier to that used by Asda. Ours is from a British supplier, Asda's is from southern Ireland.
"We have already carried out tests on a range of our beef products including burgers, ready meals and minced meat and no trace of horse DNA has been found in any of our products."
The Co-op said Greencore supplies six pasta sauces to the company, but none of these include beef.
It will announce the results of testing on its beef products tomorrow morning, a spokeswoman added.