Factory fire in Llwynypia, near Tonypandy, 'not suspicious'
A major blaze at six factory units in the Rhondda, described as potentially "extremely dangerous", is not believed to have been started deliberately.
The fire was thought to have involved a garage, a furniture company and four other units in a converted factory on Ridgeway Industrial Estate in Llwynypia, near Tonypandy.
South Wales Fire Service said other nearby units were also affected.
Some 70 firefighters were involved in tackling the incident.
Fire chiefs said they expected to be able to confirm the exact cause of the fire later.
South Wales Police said they were not treating the fire as suspicious.
The alarm was raised shortly after 16:25 BST on Sunday and smoke could be seen from miles around.
Eight crews at the scene were confronted with exploding gas cylinders and burning cars and they used three water bowsers and a hydraulic platform to fight the flames.
The blaze was eventually put out at around 03:00 on Monday. Two fire crews are still at the scene damping down.
The fire service said six factory units inside the 140m-long building had been well alight.
It is believed to have been an old factory, now shared by different businesses.
Speaking on BBC Radio Wales, Richard Prendergast of South Wales Fire and Rescue Service, said: "It was a fire in Ridgeway Industrial Estate in Llwynypia.
"Crews when they turned up were faced with a well involved fire, large amounts of black smoke, with cylinders and cars involved and a number of explosions.
"It took them some time to bring the fire under control and it's believed it has involved several small business units.
"It certainly had the potential to be extremely dangerous, a number of cylinders exploded on scene, and there were a number of collapses of the structure during different phases of fire fighting operations, but I'm glad to report that none of our firefighters were injured."
Rhondda Cynon Taf council issued a statement saying: "The council is aware of the devastation caused to local businesses as a result of the fire in Llwynypia. We will support these businesses where possible to help them overcome the effects of the fire."