The investigation has been delayed until now, due to concerns that parts of the windows and walls within St Mel’s Cathedral could collapse.
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Due to the size of the building, it is unclear how long the examination will take.
Gardaí are using a 60m-high crane with a safety cage to allow forensic experts examine the ruins. However, they declined to comment on local speculation that the fire may have started in a boiler area at the back of the altar.
St Mel's Crosier, which was over 1000 years old, was the most significant historical artefact burned in the fire.
(NS/GK)
