It's alleged to have taken place in Midlands Prison last Saturday.
Gardai have arrested 4 men in connection with an assault in a Laois prison.
It took place in the Midlands Prison in Portlaoise last Saturday, December 6th.
The men, aged in their 20s and 30s are being detained at stations in the Garda Eastern Region.
All circumstances around the incident are being investigated by Gardai.
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