Pontypridd Common gas tank blaze cordon continues
Emergency services are continuing a cordon around an acetylene cylinder found on fire in a pile of rubbish.
The fire service said restrictions will be held in place until 21:00 BST to give the gas tank a chance to cool and reduce the risk of an explosion.
Police shut Eglwysilan Road, near Pontypridd Common, Rhondda Cynon Taf, and imposed a 200m (220 yard) cordon after the cylinder was discovered.
The alert, near Pontypridd golf club, began 20:23 BST on Wednesday.
South Wales Fire and Rescue Service said the fire crew called to the scene, south of golf club, between Rhydfelin and Abertridwr in Caerphilly county, began cooling down the cylinder to reduce the risk of it blowing up.
The initial call was about refuse on fire on open ground. The acetylene cylinder was among some rubbish.
A fire service spokeswoman said: "It was placed in the middle of the rubbish first and then it was set alight. It was a deliberate thing.
"We're keeping a watchful eye on it. Because of where it is, it's difficult to keep a hose on it."
South Wales Police duty inspector Bob Nicholls said: "The fire service say that when an acetylene cylinder is on fire they can cool it down but there is still a risk that it could explode up to 24 hours after it started.
"Because of that risk, we have put a cordon on it so until any risk of still exploding is removed."