An Garda Síochána (Irish police) and emergency services responded to the incident.
Two men on board the helicopter were pronounced dead at the scene.
Gardaí are liaising with the family of one of the men, an Irish national aged in his 40s.
Gardaí have said they may require the assistance of Interpol in establishing contact with the next of kin of the second man, who they believe is from eastern Europe.
Mr Weir added: “I’m sure there’ll be prayers said and maybe a memorial or something for the families, locally.”
