Post mortem exams are due to be carried out on the bodies of three family members who were found dead in Co Louth.
Mark and Louise O'Connor, who were in their 50s, and their son Evan who was in his 20s were violently killed near the village of Tallanstown.
A man in his 30s remains in garda custody.
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Crime Editor with the Irish Times, Conor Lally says the suspect was arrested near the scene of the deaths yesterday.
