Prabhu and Bharathi complained of chest pain and when the police escort team stopped the vehicle in which they were being taken, they attacked two policemen and escaped, they said.
The two injured policemen have been admitted to hospital.
Police have registered a case and are searching for them, sources added.
26-year-old police Sub-Inspector Allwyn Sudan was stabbed to death in Sivaganga district by a group of youths on October 27 when he asked them to take an alternative route while they were on their way to attend the death anniversary of the Maruthupandiyar brothers.
