At least 250 cadres of the Pattali Makkal Katchi (PMK) were taken into preventive custody in Cuddalore district on Tuesday when they were proceeding to Chennai to take part in a protest called by the party to demand 20% reservation for Vanniyars.
Police sources said that security had been tightened at all check posts and the cadres were detained as a precautionary measure.
In Villupuram district, about 55 PMK cadres were detained when they resorted to a road roko at Kooteripattu, Melpettai and Mailam to protest against the police preventing party cadres from proceeding to Chennai.
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However, no arrests were made in Kallakurichi district. Police sources said that heavy police force was deployed at the toll gates at Ulundurpet and Madur in the district.