A third teenager has been arrested following a fire at a factory in Drogheda, Co Louth.
The 17 year old boy is being held at Dundalk garda station.
The fire brigade had been working on tackling the blaze all day in the Donore Industrial Estate.
The Dawn Paper Plant has been destroyed as a result.
Another youth of the same age remains in custody.
Earlier a 14 year old was arrested and has since been released without charge.