77 assaults on prisonofficers last year
Six prison officers at Magilligan Prison were assaulted last year: the lowest rate of assault in the North's jail system.
Forty-nine officers were assaulted at Maghaberry, and 22 at Hydebank.
The 77 assaults took place between December 1, 2015 and November 30, 2016.
“Assaults in prison cover a wide range of violent incidents and it is not possible to provide a further breakdown by type,” said Justice Minister Claire Sugden.