They were among the students who were recently promoted to third year after they had failed in two terms. Claiming seniority, they declined to sit with regular students and were demanding extra classes in separate rooms.

They also demanded that their third year course be completed in eight months instead of 12 months to avoid session loss.

But heads of Pharmacology, Microbiology and Forensic departments declined to accept the illogical demands.

This angered them. At about 11 am on Monday, they ransacked rooms and damaged widows and doors in the three departments. Their teachers however controlled the situation.

It was also alleged that the unruly students belonged to ruling BNP's student wing JCD (Jatiyatabadi Chhatra Dal) and were instigated by its leaders at BSBMC.

Prof. Dr. Golam Mahmud Selim, principal-in-charge and the three departmental heads-- Prof. Dr. Jamaluddin of Pharmacology, Prof. Dr. Jahangir Hossain fof Microbiology and Prof. Dr. M A Barek of Forensic-- acknowledged the incident but ruled out any possibility of separate classrooms for the irregular students and curtailing the course period. The number of irregular students is only seven against 147 regular students.