The buildings in question were linked to, or rumoured to be linked to, asylum seeker accommodation.
The Garda Commissioner insists the force is working hard to identify those responsible for arson attacks on refugee accommodation.
A number of buildings linked to - or rumoured to be linked to - asylum seekers have been burnt down in recent months.
Commissioner Drew Harris says local investigations are underway, and the DPP is considering files following a number of arrests.
Speaking in Tullamore, he said Gardaí have also launched two nationwide investigations:
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