Milk contaminated with illegal levels of dioxins has been found at two dairy farms in Northern Ireland.
Contamination of the milk is likely to be from dioxin residues in the fat of animals that had previously eaten contaminated feed.
The same contaminated feed resulted in beef and pork products being removed from supermarket shelves in the run-up to Christmas.
The milk was distributed across Northern Ireland and in the Republic.
The Food Standards Agency has not ordered the withdrawal of the products.
Officials said the risk to health from drinking the affected milk or eating products made from it is extremely low.
The FSA will continue to test and restrict the milk until it complies with the law.
Health effects from eating the affected products are only likely if people are exposed to relatively high levels of this contamination for long periods.
Last year pork was stripped from supermarket shelves and beef herds blocked from sale after livestock was found to have consumed tainted feed from a centre in the Republic of Ireland.
Farmers in Northern Ireland are pressing for compensation from the Irish Government after being forced to hold their animals because of the scare.
