Fire crews were called to battle a blaze at a builder's merchants in Larne on Tuesday night.
It's believed the incident centred on a branch of the MacBlair builder's suppliers yard in the Co Antrim town.
Around 46 firefighters and six officers were deployed at around 8pm.
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A tweet from the Northern Ireland Fire and Rescue Service at around 10.45pm said: "NIFRS have been called to a fire in a timber store at MacBlair, Builders Merchants, Larne, at 19.58hrs tonight. Six fire appliances, an aerial appliance and a command support unit from Kilrea, The incident is ongoing at present."
Appliances from nearby Ballyclare, Whitehead, Carrickfergus and a specialist turntable appliance from Belfast were called to the scene. No cause of ignition has yet been established.
NIFRS North said: "Fire crews from Larne, Whitehead, Carrickfergus, Ballyclare and a turntable ladder from Belfast Command are tackling a major fire in the Station Road area of Larne.
"Crews are fighting the fire with firefighting jets, breathing apparatus and a turntable ladder."
Station Road and Circular Road in the town were closed but have now reopened.
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