There were also 70 assaults by prisoners on staff.
There were 320 assaults in Irish prisons last year.
250 involved prisoners attacking other inmates - with 64 in Cork jail, 44 in Castlerea in Roscommon, and 29 in Midlands Prison in Portlaoise.
Almost four out of every five involved prisoner-on-prisoner attacks.
Eoghan Murphy reports:
There were also 70 assaults by prisoners on staff.
Jim Mitchell, from the Prison Officers Association, says several staff have suffered serious injuries over the years
.

Athy Locals Praised After Elderly Dog Saved Following Dramatic Canal Lock Ordeal
€4.4m Cannabis Seizure Sparks Arrests Across Kildare And Dublin
Survivors’ Stories And Counselling Gave Kildare Woman Maeve Leahy Strength To Speak Out About Abuse
€34.5m Boost Backs Quest To Study Memory Loss And Build 3-D Biodegradable Spinal Supports
13 New Gardaí For Kildare - But No Increase For Part-Time Maynooth Station
Kildare’s Rain Warning Brought Forward To 9am As Remnants Of Storm Claudia Approach Ireland
Christmas Gift Caution As E-Scooters Leading Cause Of Child Brain Injuries
€540k Worth Of Ketamine Seized In Major Kildare Raid