We could see a return to the record level of overcrowding witnessed in hospitals last week.
That's the warning from the HSE's Director for Emergency Management.
Around 300 patients are on trolleys this afternoon - down from a peak of over 600 on Tuesday.
Health Minister Simon Harris has apologised to those affected - while the HSE announced a range of initiatives to resolve the crisis.
Damien McCallion is Director for Emergency Management with responsibility for the Winter Initiative:
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