A fire crew from Cefn Fforest was called to a deliberate fire at an abandoned building site near Blackwood.
One appliance attended at the site at The Rise, Fairview, at 12.04am on Wednesday July 17, where an outdoor structure was alight. Firefighters took 30 minutes to extinguish the fire.
A spokeswoman for South Wales Fire and Rescue Service said the fire was deliberate.