Passengers from countries that will officially go on the category two mandatory quarantine list from tomorrow have been arriving at Dublin Airport.
Anyone traveling from an additional 16 countries, including the US, France, Canada and Italy, will have to enter mandatory quarantine from Thursday.
Less than three weeks after it was set up, the Government's mandatory quarantine system has had to pause bookings as it ran out of hotel capacity.
The Department of Health said this was due to a problem with "walk-ins" or people who simply turn up rather than having booked online before departure.