: Dublin Fire Brigade say the roof of the 'Store It' industrial unit at Ballymount Industrial Estate has collapsed.
They expect to have crews on scene for the next 24 hours.
: People with respiratory conditions are being warned to avoid the area of West Dublin affected by today's fire.
C.O.P.D Support Ireland is warning people with respiratory conditions, such as COPD and asthma, to avoid the area if possible and to stay inside with the windows and doors closed.
More than 50 firefighters are tackling a blaze in Dublin this lunchtime.
The alarm was raised at around 10.15am at the 'Store It' industrial unit at Ballymount Industrial Estate.
The Dublin City Fire Brigade says the smoke is still heavy.
They said seven fire engines are attending the scene, as well as a hydraulic platform and a turntable ladder.
An incident command unit and an ambulance are also there.
Major Fire at un-sprinklered storage warehouse in Dublin this morning pic.twitter.com/8P9ZJ79vso— Writech Group (@WritechGroup) April 29, 2015
Fire crews are using breathing apparatus in the operation which is ongoing, and the unit has been evacuated.
There are no reports of any injuries.