The incident had started out as a fight began between brothers over the possession of land at Sitaguri village in Ambari area. The situation was then contained for some time after the intervention of police, they said.
However, by evening the situation snowballed into a clash between the two political parties in which sticks were used and 20 persons were injured from both sides, they added.
Police then rushed to the spot and brought the situation under control. No complaints were lodged in connection with the incident.
Police said six of the injured were released after treatment at the health centre and four of them are still being treated there.