The boat was found without an engine, they said.
It is also not known whether the boat belonged to the Lankan fisherman who was rescued by the local fishermen and handed over to the coastal marine police, two days back.
Tamil Nadu Coastal Marine Police seized the boat and registered a case.
On December 17, Maria Dasan from Pesalai in the island nation was caught in the rough sea and had strayed into Indian waters in his boat off the coast here.
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