Approved supplier Welsh Bros Foods confirmed a sample of its frozen minced beef has 'potentially tested positive' for above 1% horsemeat.
Wholesaler Castell Howell have contacted customers after a 'possible contamination' of cottage pies.
The Welsh Government says it is working with the police to ensure allegations of horse meat at a plant in west Wales are dealt with.
– Newport City Council spokesperson
Newport City Council’s trading standards department is working with Newport company Welsh Bros. Foods Ltd following positive test results for horsemeat.
Investigations into the source of the contamination are ongoing and a product withdrawal is being overseen.
All action being taken is in line with Food Standards Agency guidelines.
Newport schools do not use this supplier; however, investigations into whether council care homes have purchased this specific product are being carried out.
Bridgend County Borough Council has confirmed it has stopped using frozen minced beef supplied by Newport company Welsh Bros Foods.
It comes after a sample of frozen mince from Welsh Bros Foods reportedly tested positive for horsemeat.
– Bridgend County Borough Council spokesperson
“While to date no health issues have been identified within Bridgend County Borough, we have stopped using frozen mince beef provided by one supplier as a precautionary measure.
This follows tests carried out by a neighbouring authority on a random sample of meat from the same supplier which tested positive for the presence of horse DNA.
We are liaising closely with our partners in the Wales Purchasing Consortium and the Food Standards Agency in this matter and will be carrying out further tests.
Pembrokeshire and Cardiff Councils have confirmed they have withdrawn certain beef products from use in schools and care homes following the announcement.
Welsh Bros Foods says it is 'deeply shocked' at the reported find but believes it is an 'isolated incident'.
Cardiff Council says it has withdrawn all Welsh Bros Foods beef products from its schools, leisure centres and care homes.
It follows news that a sample of frozen minced beef supplied by the Newport-based company has reportedly tested positive for horsemeat.
Pembrokeshire Council has also withdrawn mince from its menus following the announcement.
No products have yet tested positive for equine DNA in Cardiff, but the council says it has taken the step 'as a precaution'.
– Cllr Heather Joyce, Leader of Cardiff Council
I have no hesitation in taking this precautionary step whilst testing continues as it is vital that we do everything possible to identify whether there is any possibility of horsemeat DNA being in any of the products we use, and this process continues.
It is important that we move as quickly as possible to respond to the situation as it develops. I am pleased that so far we have not had any positive results for products we have tested for horse DNA but we have to continue to test and remain vigilant.
Welsh Bros Foods says it is 'deeply shocked' following the reported test result but believes it is an 'isolated incident'.
Welsh Bros Foods says it is 'deeply shocked' that a sample of its frozen minced beef has reportedly tested positive for horsemeat.
– Welsh Bros Foods spokesperson
Welsh Bros Foods regrets to announce that late yesterday afternoon we were informed that a formal sample of our frozen free flow minced beef has been reported to have potentially tested positive for above 1% horse meat. We have not as yet had formal confirmation on this result; however, we have taken the decision to notify our customers of this issue immediately, and issue a withdraw notice for this product.
Welsh Bros Foods are deeply shocked by this development and are working with all relevant authorities.
The firm said the affected batch was produced nearly three months ago and other samples have reportedly tested negative for horsemeat, adding: "We therefore believe at this stage that this is an isolated incident."
The Welsh Affairs Committee says it is 'concerned' following news that horsemeat has reportedly been found in a batch of mince produced by a supplier in Wales.
– Welsh Affairs Committee spokesperson
The Food Standards Agency and police are leading an investigation into this serious matter and the Committee does not want to jeopardise those investigations. We will pay close attention to how the situation develops. The Committee stands ready to conduct its own investigation if necessary.
Pembrokeshire County Council has withdrawn mince from its menus after being told a batch of frozen minced beef has potentially tested positive for horsemeat.
The mince was supplied by Welsh Bros Foods of Newport, Gwent, and was used by the council for schools, day centres and residential homes.
The council says it has also been made aware that frozen beef products supplied to Sodexo – a company providing catering services to the authority's privately-financed initiative school in Pembroke Dock – has tested positive for horsemeat.
Sodexo has withdrawn all frozen beef products from its UK catering operations.
Beefburger products made by a mid-Wales company have been withdrawn after tests revealed the presence of horsemeat.
The Food Standards Agency say three samples tested positive for at least 1% horsemeat in tests carried out by Powys County Council.
Our West Wales reporter Kevin Ashford sent us this report from Llandrindod Wells.
Beefburger products made by a mid-Wales firm have been withdrawn after tests revealed the presence of horsemeat.
Three samples of beefburger products made by Builth Wells catering supplier The Burger Manufacturing Company tested positive for at least 1% horsemeat.
The test were requested by the Food Standards Agency and carried out by Powys County Council.
Further tests will now be carried out to establish how much horsemeat the products contain and to test for the presence of the veterinary medicine phenylbutazone.
The FSA said the company is contacting its customers to inform them of the results and to recall any affected products.
The company that made the products withdrawn from sale by Castell Howell has said they have an "exemplary record" in food quality and safety standards. Oak Farm Foods has launched a internal investigation into the matter.
– An Oak Farm Foods spokesperson
Now that we have received the necessary information we have issued notification to all customers holding any potentially affected product from this product line.
While the company carries out extensive testing on all its products DNA testing has not been widely available or the norm in the industry. However, given recent issues Oak Farm Foods has instigated a new regime that includes DNA tests. We can confirm that all tests for equine DNA on products to date have tested negative.