Rubbish in a trolley was torched in a supermarket car park.
A crew from Holywell Fire Station was called to the car park at the town’s Tesco supermarket at 6.40pm.
Firefighters used a Scotty backpack to extinguish the blaze which, according to a North Wales Fire and Rescue Service spokesman, was started deliberately.
The spokesman added North Wales Police werre also at the scene.
Anyone with information can call police on 101.