A woman is being treated in University Hospital Kerry after suffering serious injuries in an incident at a home in Tralee.
Gardaí responded to reports of a disturbance at an apartment in Tralee on Monday morning.
A woman, aged in her 70s, was taken to UHK where she is being treated for serious injuries.
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A second woman, also aged in her 70s, was treated at the scene for non-life-threatening injuries.
Gardaí say they are following a definite line of enquiry and no further information is currently available.