Four fire crews were called to Highpoint prison this morning following reports of a building blaze.
Firefighters were sent to Highpoint North in Stradishall at 9.16am.
The fire is now out, but one team remains on the scene investigating what happened, and how it started.
Two teams from Clare, one from Wickhambrook and one from Haverhill were sent to the scene.
Three of the engines are parked outside but are no longer needed.
They are expected to leave the scene soon.
There are no reports of any injuries, and the fire was out almost as soon as firefighters arrived, a spokesman for Suffolk Fire and Rescue Service said.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here