Pembrokeshire County Council has withdrawn mince from its menus after being told a batch of frozen minced beef has potentially tested positive for horsemeat.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Sodexo has withdrawn all frozen beef products from its UK catering operations.
Approved supplier Welsh Bros Foods confirmed a sample of its frozen minced beef has 'potentially tested positive' for above 1% horsemeat.
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.