The fire broke in Tullamore last week.
A man in his 20s and a teenager have been arrested in connection with an incident of arson in Offaly.
The fire broke out in the old Quinnsworth building in Tullamore on Tuesday of last week.
The men have been released and a file is being prepared for the DPP.
Gardaí are thanking the public for their assistance and renewing their appeal for anyone with any information to contact them.