Seven Tamil Nadu fishermen were injured on Monday after Sri Lankan naval personnel allegedly attacked them off Dhanushkodi.
The fisheries department officials quoted one of the fishermen as saying they were not in Sri Lankan waters, but in deep sea to ply their trade when they were attacked.
Officials said the fishermen were treated at a private hospital but were afraid to give a complaint to police.
Police said they had not received any complaint.
All the fishermen belong to Pamban near the coastal town.