On Friday, it emerged beefburgers containing horsemeat had been withdrawn from hospitals in Northern Ireland.
It has emerged that some beefburgers on sale in UK and Irish Republic supermarkets contained horsemeat.
The tests were carried out following the discovery of horse meat in beefburgers produced in County Monaghan.
In total, about 10 million value beefburgers were withdrawn from sale across all of the supermarket chains implicated.
Traces of both horse and pig DNA were found in value beefburgers sold in Iceland, Tesco, Aldi, Lidl and Dunnes Stores.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
Procurement agency Scotland Excel had already advised local authorities to place on hold the use of frozen beefburgers following the discovery.
Two Northern Ireland education boards, North Eastern and South Eastern, have also withdrawn beefburgers from school menus over the horsemeat issue.
Food safety officials in the Irish Republic discovered the presence of horse meat in beefburgers during tests carried out late last year.
Traces of both horse and pig DNA were also found in frozen value beefburgers sold by Iceland, Lidl and Aldi and Dunnes.
The discovery of horsemeat traces in some beefburgers, which food standards authorities in the Irish Republic say they believe came from Poland.
It emerged in January that some frozen beefburgers supplied by Dalepak and two Irish firms, on sale in the UK and the Irish Republic, contained horsemeat.
The UK Food Standards Agency (FSA) said on Wednesday that food standards authorities in the Irish Republic are certain that horsemeat found in beefburgers came from Poland.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
On Wednesday, the UK Food Standards Agency said that food standards authorities in the Irish Republic were certain that horsemeat found in the beefburgers came from Poland.
The scandal emerged in mid-January, when Irish food inspectors announced they had found traces of horsemeat in some frozen beefburgers stocked by UK supermarkets including Tesco, Iceland and Lidl.
The tests by Irish authorities last month found horsemeat in beefburgers made by firms in the Irish Republic and the UK and sold in supermarket chains including Tesco and Aldi.
The horsemeat scandal emerged in mid-January, when Irish food inspectors announced they had found traces of horsemeat in some frozen beefburgers stocked by UK supermarkets including Tesco, Iceland and Lidl.
Last month, Irish food inspectors said they had found horsemeat in beefburgers made by firms in the Irish Republic and the UK, and sold by a number of UK supermarket chains.
BBC: Scots farmers 'angry and betrayed' by horsemeat scandal
On Thursday, ALDI UK said it had suspended its contract with Dalepak, which is also owned by ABP, to supply beefburgers and was conducting further investigations at its factory in Yorkshire.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
Maria Jennings of the FSA explained how the organisation had reacted when informed by the authorities in the Republic of Ireland that horsemeat had been found in beefburgers sold in some supermarkets.
"People in our country will have been very concerned to read this morning that when they thought they were buying beefburgers, they were buying something that had horsemeat in it, " he said.
Meanwhile, in Northern Ireland and the Republic of Ireland, police have been asked to consider whether the beefburgers were adulterated accidentally, in terms of labelling, or whether it was the result of fraudulent activity.
In the UK, three Aldi burger products - frozen Oakhurst 100% beef quarterpounders, frozen specially-selected Aberdeen Angus quarterpounders and frozen Oakhurst beefburgers (16 pack) - were withdrawn when the horsemeat discovery was made public.
While the British Food Minister David Heath believes the horsemeat in Tesco's beefburgers originates from "a third-party country", figures from the Irish Department for Agriculture reveal a six-fold increase in the number of horses slaughtered at government-licensed abattoirs since the recession took hold.
应用推荐