UP to 60 students protested at the UCD campus yesterday at a visit from Tanaiste Mary Harney over fears of increases in college fees.
Deputy Harney was met by an angry group of students as she attended the opening of novaUCD, a ?10m innovation and transfer technology centre.
Students waved placards as gardai tried to keep them back. One man was knocked to the ground after he tried to cross a barrier.
A Garda spokesperson last night said the no arrests were made at the protest.
This latest protest follows a large demonstration in Limerick last week which saw almost 5,000 students protest against a feared hike in student registration fees next year.
The protests are part of a series organised by the Union of Students in Ireland (USI). More protests are set for Galway and Cork before culminating in a demo outside Leinster House on Budget Day.