A case has been registered under IPC section 506 (criminal intimidation) on the instructions of the National Investigation Agency which is probing the case relating to the attack on Prof T J Joseph who was attacked and his palm was chopped off while he was returning after a Sunday mass on July 4, 2010 at Thodupuzha in Idukki.
The father of the prime witness was waylaid by a group of persons and threatened that his son should not give evidence during the trial of the case which has begun.
The witness had taken Joseph to the hospital soon after the incident.
NIA has framed the charges against 31 accused.