The fishermen were fishing near a sand hillock in Indian waters when the Lankan Navy came in two boats and allegedly beat them up with sticks, said Plavumin Thiyakarajan, Assistant Director, Fisheries department.
The Lankan navy personnel told them they were fishing in Lankan waters and sent them back with a warning, officials said.
Meanwhile, the remand of 30 fishermen of Rameswaram and Thangachimadam, lodged in a Sri Lankan prison since their arrest on April 6 on poaching charges, was today extended till May 20 by a court, S Emerite, Thangachimadam fishermen's association president said.