A man is being held in custody in Co Louth in connection with an alleged attack involving a hatchet on Friday.
A woman in her 80s was taken to Our Lady of Lourdes Hospital in Drogheda with serious injuries following the incident, which happened at a house in Dundalk.
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She remains in a serious condition, and has been transferred to Beaumont Hospital in Dublin.
Two other women were taken to Louth County Hospital with less serious injuries.
A Garda spokesperson added that investigations are ongoing.