Police said the duo, accused in the murder of DMK Headquarters Executive Committee member Muthu Rajendran, had come to sign the register at the police station as part of their bail condition when a gang barged in and hacked one of them and hit him with stones, killing him on the spot.
The other man made a vain bid to escape and ran a few feet away from the police station, but the gang went after him and struck him on the head with stones. He too died on the spot, police said.
Police said an enquiry is being held into the incident.