S Emirit, President of the Fishermen's association, said the fishermen suffered internal injuries and were given pain killers at the Government Hospital here on their return.
They were arrested yesterday and taken to a camp in the island nation, beaten up by the naval personnel and later let off with a warning not to cross the International Maritime Boundary Line (IMBL).
He said the five victims were part of a group which had put out to sea on June 2. The naval personnel had also seized their fishing nets and other equipment, he said.