Over 150 activists belonging to several student unions and Dalit organisations on Monday staged a black flag protest against the visit of Prime Minister Narendra Modi and his cabinet colleague Bandaru Dattareya in Coimbatore.
However, the police acted swiftly and arrested them before the prime minister could arrive.
According to police, the students were protesting against the death of Hyderabad University Dalit scholar, Rohith Vemula.
They demanded immediate arrest of Dattareya for his role in writing to the Union HRD Minister Smriti Irani seeking actions against Vemula and four other students.
They were later expelled from the university, a decision that proved fatal forcing Vemula to commit suicide.
Modi, who was earlier in Kozhikode to take part in Global Ayurveda meet, is in Coimbatore to address a public meeting in the textile city and launch an ESI medical college.