Marine police personnel from Mandapam, on a routine patrol, spotted the fibre glass boat fitted with an outboard motor and the three persons at the first sand dune near Arichalmunai, about nine km from Dhanushkodi, Police Sub-Inspector Jyoti Basu said.
The three reportedly told the police that they were fishermen from Thalaimannar in Sri Lanka.
They were brought to Mandapam marine police station for further questioning, the SI said.
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