Gardaí investigating the fire at a factory in Drogheda have made a fourth arrest this morning.
A teenage boy was arrested in the Drogheda area and is being held under the provisions of Section 4 of the Criminal Justice Act 1984 at Dundalk Garda Station.
Gardaí are questioning him in relation to the investigation into the suspected arson attack at the Dawn Paper Factory.
Two 17-year-old boys and another 14-year-old, who had been detained yesterday, were released last night.
Fire fighters say the roof of the factory on Donore Road has collapsed and there is extensive damage to the building.