The Midlands Prison was at over 100% capacity yesterday.
The country's overcrowded prisons have been described as a "ticking time bomb."
The Midlands Prison was at 110%capacity yesterday, with nearly 100 more inmates than there are beds available.
While Portlaoise Prison was also overcrowded, 105% capacity.
Nearly 5,000 inmates are in cells in facilities nationwide with the ability to hold around 4,000.
Gabriel Keaveny of the Prison Officers Association says overcrowded cells are a recipe for disaster:
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