According to Nedumangad police, tension erupted in the area after a local CPI(M) leader was allegedly attacked by SDPI activists on Sunday evening.
Later, unidentified persons allegedly targeted the houses of SDPI workers.
Masked individuals were seen damaging an ambulance and a car owned by an SDPI activist on Sunday night, police said.
In a suspected retaliatory move, an ambulance operated by the Democratic Youth Federation of India (DYFI), the youth wing of the CPI(M), parked near a government hospital, was set on fire early Monday morning.
Police said a probe is underway to ascertain whether the attacks were a fallout of the earlier clash and to identify those involved.Also, patrolling activities have been strengthened to prevent any further clashes in the area, police added.