South Wales Fire Service says the site of a serious fire on the Glyndwr Industrial Estate in Aberbeeg on Tuesday is now safe enough for investigations to begin.
The site is still smoking, and locals are still being warned to keep doors and windows shut and minimise the time they spend outside.
Meanwhile, Environment Agency Wales officers confirm that there has been no environmental impact on the River Ebbw, and the excess water from tackling the blaze is safely contained on the site.
Firefighters are still at the scene of a blaze which destroyed a warehouse in Blaenau Gwent. The fire which broke out at the Glandwr Industrial Estate near Aberbeeg yesterday saw homes evacuated and a school closed for the day.
Adrian Moyse from South Wales Fire & Rescue says that the fire at Glyndwr Industrial Estate in Aberbeeg in Blaenau Gwent may burn for another 24 hours.
Around seventy firefighters have been tackling a blaze at Glandwr Industrial Estate near Aberbeeg. It broke out just after 1am and spread to a garage and a carpet warehouse. Officers say there has been a partial collapse of a building.