The fire was brought under control, and Gardaí are continuing their investigation into the incident.
The Irish Muslim Council has strongly condemned the fire at a mosque on Talbot Street, Dublin, describing it as a shocking attack on a place of worship.
A man in his 40s has since been arrested by Gardaí in connection with the blaze.
Four fire engines, a turntable ladder and more than 20 firefighters and paramedics were sent to the scene after the alarm was raised shortly before 4 o'clock yesterday afternoon.
The fire was brought under control, and Gardaí are continuing their investigation into the incident.
No one was injured and the building was safely evacuated.
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