South Wales Fire and Rescue service will investigate what caused a blaze at a recycling plant on Newtown Industrial Estate in Cross Keys, Caerphilly.
The blaze broke out at GLJ Recycling. A spokesperson from the fire service said 700 tonnes of scrap metal and tyres are well alight.
4 pumps and a water bowser were in attendance at the scene, along with representatives from the Environment Agency.
More top news
George North is on course to return from injury when Wales resume their RBS 6 Nations campaign against Scotland on Saturday.
It's the Year of Legends, and Natural Resources Wales have picked its top 10 places to visit, to discover the myths behind some Welsh tales.
The average Welshman can expect health problems once he's 61, two years younger than the UK figure. For Welsh women, it's 18 months later.