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.
Several garda units, including the armed response unit attended the home after 10 o'clock yesterday morning.
It is believed that all three people were violently attacked.
Fianna Fail councillor for Ardee and Mid Louth John Sheridan, says it’s a tragic situation. He says it’s a shocking time for the community.