Protests were held here by Congress and Left parties against the death of a Dalit student of Hyderabad Central University.
Members of the scheduled caste wing of Tamil Nadu Congress Committee (TNCC), led by K Selvaperunthagai, tried to picket the Shastri Bhavan here, which houses a number of central government offices.
About 65 Congress workers were detained, police said.
The protesting Congress workers sought a CBI probe into the death of Rohith Vemula, a Dalit scholar of HCU, who was found hanging at the central varsity's hostel room on Sunday.
Members of SFI, affiliated to CPI (M), also staged a protest demonstration.
MDMK founder Vaiko demanded action against Union Labour Minister Bandaru Dattatareya and HCU Vice-Chancellor Apparao in connection with the 26 year-old student's death.
"Dattatreya should be sacked (as Minister) while the Vice-Chancellor should be arrested," he said and appealed that the rights of students belonging to Dalit and other backward communities must be upheld.
(Reopens MES8)
DMK President M Karunanidhi sought legal action against those behind the suicide of Vemula.
"It is the expectations of all that there should be just legal action against those behind the suicide of the Dalit student," he said in a statement.
