60 Trinity College students claim to have been locked into the campus' Dining Hall without access to food, water or toilets.
The Take Back Trinity group said that at approximately 5 pm on Wednesday, entrances to the Dining Hall were blocked by external security services.
The students are protesting the €450 fee to repeat exams.
In a release, they stated: "Security have made it clear that no food or water will be permitted in the Dining Hall. Toilet access has also been cut off.
"This was a peaceful occupation, with students allowed to enter and leave the building freely up until now."
€450 to repeat exams... 'from an institution that is purchasing a €1.95 million apartment for their Provost it is scandalous that students in a vulnerable position will now see these types of charges imposed on them.' - @AodhanORiordain https://t.co/OeX5KgmXpi #TakeBackTrinity— Ruairí McKiernan (@ruairimckiernan) March 13, 2018
I support the students of Trinity College who are protesting against the €450 exam repeat fee!— Harry McCann (@TheHarryMcC) March 14, 2018
We all make mistakes, and deserve the opportunity to try again. It is hard enough, and expensive enough already to be a student in Ireland #TakeBackTrinity #OccupyTCD https://t.co/th0SiJPy9h