Though bombs were also hurled, the injuries were a result of stone-pelting, they said, adding that the injured were admitted toa co-operative hospital at nearby Thalassery.
The CPI(M) alleged that RSS activists were behind the incident.
The ruling party in Kerala has called for a 12-hour hartal in the area tomorrow to protest against the attack.
Additional personnel had been deployed in the area as a precautionary measure, the police said.
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