A man in his 20s is being held at a Midlands garda station.
Gardaí involved in a murder investigation stemming from a fatal house fire in Offaly have made an arrest.
A man in his 20s was arrested this morning in relation to the incident which led to the deaths of four year old Tadgh Farrell and 60 year old Mary Holt.
Tadhg's grandmother remains in hospital for treatment to serious burn injuries.
A black Kia Rio car with a 08-D registration was later found burnt out in County Kildare.
In the last few weeks Gardai have carried out more than 250 house-to-house inquiries and retrieved more than 60 pieces of CCTV footage.
The man is currently being detained on suspicion of murder at a station in the Midlands.
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