They did not let the vice-chancellor Sushanta Duttagupta and three senior officials to leave the central office till 11 pm, the police said.
A scuffle broke out when the acting registrar, Manimukut Mitra, tried to leave the office in the evening, officials said.
Hundreds of students and their parents had been agitating against the admission policy that stopped the "internal quota" system for the school students while getting admitted in the higher classes in the college and university.
Meanwhile, President of Bangladesh, Abdul Hamid, would reach here tomorrow and the Pous Mela, started by Rabindranath Tagore's father, would begin early tomorrow morning.
