President of local Fishermen's Association Yesu Raja told reporters here that the Sri Lankan Naval men, who came in four boats warned them at "gunpoint" to return, while they were fishing between Dhanushkodi and Katchatheevu and that they had crossed the International Maritime Boundary Line.
The Navalmen also cautioned the fishermen not to come to the area in future for fishing, he alleged.
Yesu Raja sought the help of the Coast Guard to identify the IMBL.
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