A bus carrying BJP workers was stopped by the police near Dhupjhora, a village in a forested area, and the activists got down from the bus and started hurling stones towards the policemen, Maiti said.
The policemen were outnumbered by the BJP workers and 12 police personnel, including additional SP Thendup Sherpa, were injured by the stone pelting, he said.
Sherpa suffered serious injury in the eye and was hospitalised, said the SP who has visited the spot.
A large contingent of Rapid Action Force (RAF) and police were deployed in the area.
Several cars and buses were also damaged in the incident.
The BJP was supposed to hold a rath yatra from Cooch Behar during the day, which could not be held since it was sub-judice.
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