Assistant Director of Fisheries Markandeyan said that the reason for the detainment, which took place around 11 PM last night, was not known. The Sri Lankan Navy has also taken their five boats into custody.
Authorities came to know about the incident from a fisherman who managed to escape with his boat from the Lankan naval men, he said.
Nandhini Dhinani, Collector of Mannar district in Sri Lanka, said that the five boats have been detained at the Mannar navy camp.
Four Tamil Nadu fishermen, who were detained for intruding into Lankan waters, were released on June 16.
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