Three others swam to safety, they said.
Police said the seven persons set out for fishing last night without obtaining permission and the coracle started capsizing around 11.30 PM.
Police on being informed rushed to the spot and launched a search for the missing persons, but called it off for the day due to bad light.
The search resume tomorrow, they said.
The services of naval divers have been requisitioned and they are expected to arrive here tomorrow, police said.
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