AIADMK legislator Ohm Sakthi Segar and his son were injured in a clash between two groups near Puducherry, police said on Saturday.
Past enmity between the legislator and the other group was alleged to be the reason for the clash last night, police said.
The legislator's vehicle was damaged while the shop of a member of the rival group was damaged.
Police registered cases on the basis of complaints received from both the groups.
Two members of the rival group were also injured.
All the injured have been admitted to hospital.
AIADMK Puducherry unit secretary A Anbalagan, who visited Segar at the hospital, alleged that law and order was in the doldrums in Puducherry and even elected legislators were insecure.