Northern Ireland's health minister has urged the Irish Government to introduce quarantine rules similar to the UK for visitors from Denmark.
The British government has banned all non-UK citizens coming from Denmark because of concerns about a new strain of Covid-19 that has spread from mink to humans.
British citizens returning from Denmark, and everyone in their household, must isolate for 14 days from the date they left the country.
The Stormont Executive has introduced a similar quarantine period for anyone who has travelled from Denmark since 23 October.
There are no direct flights between Northern Ireland and Denmark, so visitors and returning holidaymakers travel through Dublin airport or airports in Scotland, Wales or England.
A flight from Copenhagen was due to land in Dublin this evening.
At present, travellers from Denmark are allowed entry to the Republic of Ireland on condition that they restrict their movements for 14 days.
Stormont Health Minister Robin Swann has now asked the Irish Government to introduce similar measures to the UK "in the interests of the safety of all citizens on our island" and to "ensure this strain does not reach our shores."
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In a letter, he said the British government is acting to protect all its regions from "the potentially severe consequences" of the new strain.
He urged his counterpart Stephen Donnelly to ensure that anyone travelling home to Northern Ireland via Dublin is made aware of the need to isolate.
"Given that it is your view that information on travellers to NI who have arrived by ports in Ireland cannot be shared, I would urgently ask you to contact all NI-bound travellers who have completed Irish PLFs (Passenger Locator Forms) and contact them to ensure they are aware of the need to self-isolate along with their household members," the letter said.
"I would ask this cover for all arrivals in the previous 14 days and all future arrivals with a Danish travel history until this issue is resolved."
