Three men and a teenage boy have all been released without charge.
A man in his 20s has been released without charge after being arrested in connection with a fatal house fire in County Offaly.
It comes after two other men in their 20s and 30s, and a teenage boy were released last night after being arrested on Wednesday.
A file will be prepared for the Office of the Director of Public Prosecutions.
Investigations are ongoing.
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