Tamils in Vadamarachchi held a vigil at Point Pedro beach on Wednesday evening in memory of protesters in Thoothukudi shot dead by Tamil Nadu police.
The event was organised by the Tamil National People's Front.
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.