4 year old Tadgh Farrell and his great aunt Mary Holt were killed in the blaze.
The man in his late 20s arrested yesterday in connection with a firebombing of a house in Offaly has since been released without charge.
4 year old Tadgh Farrell and his great aunt Mary Holt were killed in the blaze in Edenderry last month.
Another woman, the boy's grandmother, suffered serious burn injuries.
A file will be prepared for the Office of the Director of Public Prosecutions.
Investigations are ongoing.
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