Three fishermen from Neduntheevu (Delft) were assaulted by Sri Lankan navy officers last week.
Thiyogupillai Yesuthasan, Sahayan Selvan and Mariathas Vasantharaj were forced to land ashore on Kachaithivu, after their boat ran out of fuel on Friday.
The three were arrested by navy officers stationed at the island and beaten severely with batons.
After being kept overnight at the camp, the fishermen were ejected from the island still with a fuel-less boat.
The stranded group were found at sea by fellow fishermen and helped back to land, three days after they had set off.
The incident has been reported to Kayts police.