Tamil Nadu on Friday witnessed sporadic protests against the killing of 20 alleged red sander smugglers by Andhra Pradesh Police on April 7.
MDMK general secretary Vaiko and his party cadres were detained in Vellore when he attempted to lead a protest rally to Andhra Pradesh and picket the Chittoor district collector's office.
Vellore is around 140 km from here.
Demonstrations were also held by members of the VCK here and several members were arrested for damaging glass panes of an Andhra Bank branch here.
PMK leader S. Ramadoss said his party would organise a state-wide protest, demanding a judicial probe into the killings.