One person has so far been recovered after the coastguard helicopter went down off the Mayo coast in the early hours of yesterday morning.
The LE Eithne kept searching through the night, while a survey vessel has just arrived on the scene to carry out a sonar search.
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Navy and Garda divers, Ballyglass and Achill lifeboats, the LE Roisin, a fixed wing aircraft and two helicopters will also be involved at various points today.