Another demonstration was held in Jaffna on Friday as Tamils expressed solidarity with protesters in Thoothukudi, Tamil Nadu and condemned the police violence against them.
The protest, organised by the Tamil National People's Front (TNPF) took place in Jaffna town.
Nine people were killed and 65 injured on Tuesday in Tamil Nadu after police opened fire at protesters in Thoothukudi, who had been seeking a ban on Sterlite Industries' copper plant.
The protesters, who launched their protest many months ago, accuse Sterlite Industries of releasing pollutants from its plants and have been demanding the plant be closed.
