The BBC reports that horse DNA has been found in some beefburgers being sold in UK and Irish supermarkets, the Republic of Ireland's food safety authority (FSAI) has said.
It said there was no risk to health.
The burgers were on sale in Tesco and Iceland in the UK and Ireland. In the Republic of Ireland they were on sale in Dunnes Stores, Lidl and Aldi.
The FSAI said the retailers stated that they were removing all implicated batches of the burgers.
Horsemeat accounted for approximately 29% of the meat content in one sample from Tesco.
In addition, 31 beef meal products, including cottage pie, beef curry pie and lasagne, were analysed, of which 21 tested positive for pig DNA.