Four fishermen from this coastal town were injured when they were attacked allegedly by Sri Lankan naval personnel near Katchathivu islet on Sunday.
Police said the Naval personnel also damaged more than 10 fishing nets of the fishermen.
They said the fishermen came back and got themselves admitted to various hospitals without informing the authorities concerned.
Officials are now making enquiries with various hospitals to find out where the fishermen have been admitted.
The fishermen had put out to sea in a boat early on Sunday morning.