Magilligan Prison has now returned to normal following a minor fire on Monday afternoon.
It is understood that staff and prisoners were forced to evacuate the premises after a minor fire broke out in the kitchen of an accommodation unit shortly after 12.30pm.
Two fire appliances from The Northern Ireland Fire and Rescue Service attended the incident.
A spokesperson for the NIFRS said: “Firefighters attended a minor incident in Magilligan Prison. Firefighters ventilated the kitchen area but no firefighting took place.”
The blaze was brought under control by 1pm.
The prison has since returned to normal.
No injuries among staff, prisoners or visitors have been reported.
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