Pettai police have arrested 21 persons from two communities for allegedly being involved in rioting and attacking a police officer on Saturday night.
Police said members of two communities were involved in a clash over a trivial issue on Saturday night, in which Aathimoola Pandi (28) of Vengupuram in Pettai sustained cut injuries.
In retaliation, Murugan and Selvam of Kakkan Nagar were attacked and a couple of houses were damaged.
When Pettai Police Inspector Vijayakumar tried to quell the crowd, he was also attacked in which he sustained injuries in his head and hand.
Following the sudden development, striking forces were deployed around the trouble-spot to bring back normality.
The Pettai police have arrested 21 persons from both sides in connection with rioting and attacking a police officer.