A fire which destroyed 10 tonnes of tyres in a ravine off a lay-by near Cardiff yesterday was probably started deliberately, according to fire fighters.
Nine fire appliances arrived to battle the blaze which sent a huge plume of black smoke rising over the city.
Fire officers believe flytippers dumped the tyres and they were set alight deliberately.
At the height of the blaze32 firefighters tackled the blaze while South Wales Police controlled the traffic.
They had to use foam to cover the tyres and help bring the blaze under control.
Group Manager John Brewer from the South Wales Fire and Rescue Service said the blaze could have been worse had it spread.
John Brewer from South Wales Fire and Rescue Service urges people to take unwanted items to refuse tips rather than dump them.
He said: “With the smoke and the woods behind us it could have turned in to a significant fire. I am sure it has been set alight deliberately.”
Mr Brewer added that he believed the tyres had been dumped in the ravine by flytippers.
“I can only assume from the location that they have been put there deliberately by individuals.
“And I would suggest that there has been fly tipping involved in this area probably over a number of months because there is a considerable number of discarded tyres down there.”