An Inspector belonging to the state 'Q' branch of the Police said the Lankan vessel collided with the mechanised boat and it broke into two and sank.
The Lankan Naval personnel arrested the six fishermen who jumped into the sea to escape. They were fishing near Katchathivu when it was sunk, the inspector said.
The arrested fishermen were taken to Kankesanthurai Port in Sri lanka, the Inspector and Joint Director of Fisheries Gopinath said.
Association President T Jesuraja said two boats of the fishermen had sunk and four of them were being ferried back. Five others were also being brought here in another boat when the Lankan naval personnel intercepted both vessels and arrested all of them.
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The fishermen were later taken to Neduntheevu in the island nation, he said.
Meanwhile, officials said four fishermen were missing. The fishermen, who left the island yesterday, should have returned this morning and a search has been launched by their counterparts to trace them.
Each boat owner was estimated to have suffered a loss of about Rs 10,000, he said.