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.
More top news
Will the 'potentially historic' snow storm hitting the US, find its way to the UK?
A young mother from Haverfordwest is warning others not to send explicit pictures or video after she became a victim of 'revenge porn'.
Thicker cloud across the northwest will tend to spread southeastwards through the day