Newry and Mourne Council's environmental health department said that DNA tests on samples of burgers made at Freeza Meats were found to be free from non-beef DNA.
A statement from the council said that twelve samples of Polish meat belonging to another company were being stored in freezers on the company's premises, but that they had been detained due to "queries" about traceability:
Two of these samples contained approximately 80% horse DNA. This meat had been detained for the last five months due to the condition of its wrapping and queries regarding its labelling and traceability.
More top news
Theresa May is considering options to secure statutory powers for child sex abuse inquiry but it may require 'disbanding' current panel.
London mayor Boris Johnson is backing Olympics supremo Seb Coe as his replacement.
A top Fifa official who assessed rival bids to stage the 2018 and 2022 World Cups revealed England’s was by far the strongest contender.