Two students have been arrested at UCD at a protest as Minister for Finance Brian Lenihan was due to chair a lecture at the college.
The number of students involved in the protest reached about 150.
More than 20 gardaí were on duty as well as a number of private security officers.
Students blocked the vehicle access to the building where Mr Lenihan is due to attend the function.
The students were protesting about the proposed reintroduction of third level fees.
Mr Lenihan entered the building on foot via a side entrance, at the same time as his State car drove up to the main entrance of the building where the students were protesting.
He has been able to chair the lecture at the UCD College of Human Sciences as planned.
The students involved in the protest have left.
