The security alert at Maghaberry Prison has ended. A suspect package which was received in the post has now been declared a hoax.
Visitors to the high security jail were trapped inside during the alert.
Army bomb disposal experts were called to Maghaberry Prison in County Antrim after the package was delivered in the post and was declared suspicious.
Wires and batteries were spotted as it was put through a scanner at a perimeter gate.
A spokesman for the Prison Service said about 70 visitors were unable to get to their cars and leave until the alert was over.
Afternoon visits now have been re-instated.