The disused bar was subject to false claims it would be used to house asylum seekers.
A huge amount of work will be involved in solving the suspected arson case in Ringsend in Dublin, according to a former Garda detective.
The disused pub was the scene of anti-immigration protests before it was gutted by a fire on New Year's Eve.
It was falsely claimed the disused bar was to house asylum seekers.
Pat Marry, a retired Detective Inspector, says Gardaí will be looking at social media as part of their investigation:
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