Fishing vessels from Arranmore in Donegal to Achill Island in Mayo are today joining the search for Paul Ormbsby and Ciaran Smith.

Up to 120 boats are taking part in the search off the northwest coast for the missing Rescue 116 helicopter crewmen.

This is pretty incredible. #Rescue116 pic.twitter.com/Kj81NbZlOs

— Eoin Ó Súilleabháin (@eoinos) April 8, 2017

It's almost a month since the Irish Coastguard helicopter crashed near Blackrock lighthouse off the Mayo coast, claiming the lives of all four crew members.

Garrett Morrison from the RNLI hopes the operation will benefit from today's good weather:

Six @RNLI lifeboats have launched this morning from Donegal down to Mayo in a major sea search for missing crew of #Rescue116 pic.twitter.com/vQE6mHjajO

— Niamh Stephenson (@Niamh_St) April 8, 2017