The search for a missing 18-year-old off the coast of New Plymouth will resume at 7am.

Two men fell into the water when their boat capsized off Back Beach about 6.30am Monday.

One man, a 26-year-old, swam ashore to raise the alarm and a call was made to police about 9.20am.

The second man is yet to be found and the search - which involved police, surf life savers, land search and rescue volunteers, the Taranaki rescue helicopter and the South Taranaki coastguard - was called off at 6pm.

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The man who swam ashore was taken to hospital with minor injuries.

At this stage, police believe the pair weren't wearing lifejackets at the time of the accident.