Police fired teargas shells when the SDPI activists tried to break the police cordon late this evening, police said.
The march was taken out to protest against the alleged attack on the SDPI 'Campaign Jatha' by CPI-M workers at Chavara at nearby Kollam district earlier in the day.
CPI-M denied the charge and said that it was the SDPI activists who attacked their cadres at Chavara.
The Marxist party has called a hartal in Chavara assembly constituency tomorrow in protest against the attack.
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