A major food factory owned by one of Europe's biggest suppliers and processors has been shut in Ireland after horse DNA was found in frozen burgers in new tests two days ago.
ABP Food Group said the suspension of all production at the Silvercrest Foods plant in Co Monaghan was the "responsible course of action".
The firm said that, following new results from the Irish Department of Agriculture, it believes the source of the contaminated material is one supplier.
The horsemeat scandal demonstrates how long and complicated the food chain we all depend on is. Regulating our food supply is expensive.
Some of the best, and worst, jokes and gags from Twitter users discussing the discovery of horse DNA in some supermarket beef burgers.
We've seen the jokes on Twitter but the discovery of horse and pig DNA in beefburgers poses a serious question; where did it come from?