Dozens of firefighters were called to deal with the fire
Firefighters have tackled a factory blaze which caused rail services to be cancelled in the area due to smoke obscuring the line.
Police were also called to the fire at the Pentrebach Industrial Estate in Merthyr Tydfil, south Wales, at around 0725 GMT on Tuesday.
A 200m cordon was in place around the single storey premises although it was not thought anyone was in the building.
Eleven fire appliances were sent and the blaze was put out by 1616 GMT.
The fire was in the roof space of the unit, which measures 20m by 30m.
A 200m cordon was in place around the building.
Firefighters used four main jets, four sets of breathing apparatus, one hose reel jet, hydraulic cutting equipment, a fan and a hydraulic platform which was used as a water tower.
The crews were sent from Merthyr, Aberdare, Treharris, Caerphilly, Pontypridd and Abercarn.
Replacement bus services were organised from the town after rail services were stopped but the line later reopened and trains services resumed.
South Wales Fire and Rescue Service said it its crews had difficulty entering the building and had to fight the blaze from outside.
It was not known if anyone was inside the building but no one has been reported missing.
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