Four fishermen were injured on Thursday when they were attacked, allegedly by Sri Lankan naval personnel, while they were fishing near Katchatheevu in the Palk Straits, officials said.
Sticks, bottles and stones were allegedly hurled by the Lankan naval personnel at the fishermen and their boats also suffered damage in the attack, officials said.
They also snapped the fishing nets, and seized global positioning and wireless equipment.
The injured fishermen have been admitted to a hospital at Ramanathpuram.
Katchatheevu is an islet ceded to Sri Lanka by India under a 1974 agreement between the two countries.