Prisoner asked to go back into cell after lock-up error

There was a major security incident in Portlaoise Prison last weekend when a prisoner in a high-security wing was not accounted for at evening lock-up and had to later approach prison officers and ask to be put into his cell.
The prisoner in E Block, which houses those convicted of subversive offences, approached prison officers who were having a cup of tea and requested that he be allowed into his cell half an hour after he was supposed to be locked up.