The Left Front (LF) on Wednesday took out a rally in Rampurhat town of West Bengal's Birbhum district, demanding justice for those killed in violence in the area the day before.
LF chairman Biman Bose, who led the rally along with CPI(M) state secretary Mohd Salim, said any attempt to hush up the "mass murder" would be resisted.
Bose slammed the police for "not doing anything" to rescue the villagers.
Speaking to reporters after visiting the site of the incident, Salim alleged that illegal sand mining mafia played a role in the attacks.
He demanded stern punishment for the perpetrators.
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