A Welsh food manufacturer has recalled several batches of lamb due to fears they might contain traces of veterinary drugs.
The Food Standards Agency (FSA) says Asda was one of the retailers to receive the affected batches, which were recalled last Friday.
Batches of the lamb were also distributed to Makro Self Service Wholesalers, with the FSA stressing that the products in question had now been withdrawn from sale, with point-of-sale notices also put in place within affected stores.
Food safety officials revealed that affected batches had also been distributed to "a number of other premises", but that full product details were not available due to "limited traceability".
The FSA stressed that Anglesey-based Welsh Country Foods had contacted all its customers and instructed them to remove the lamb from sale, but revealed that no premises in Scotland were thought to have been hit by the health scare.
Asda said that it had withdrawn a number of lamb products from sale at the end of last week as "a precautionary measure".
"Although the likelihood of anyone eating meat from the affected part of the animal is very low, we asked customers who had bought lamb from the affected batches to return it to their nearest store for a full refund," the supermarket chain said in a statement.
The FSA has said that investigations are continuing into the issue.
Britain's food regulator confirmed that the batches of lamb and offal had been recalled amid fears that they "may contain meat from sheep sold for breeding purposes and were not intended to enter the food chain immediately".
Some of the sheep concerned had been treated with various veterinary drugs to combat sheep scab and it is thought that the medicines were not given sufficient time to pass through the animals' systems, the FSA revealed.
Officials said that the drug Doramectin was among those administered to the sheep, with repeated exposure to the medicine having been linked to sickness and other effects in laboratory animals.